Vinyl Newbie - So Many Questions!

I have a Linn with a heavyish platter. I always hand start it by spinning it first. Otherwise you will soon stretch the belt.  With this assist, belt lasts almost forever. 

I've had a look at your TT Model and it is a model that has quite a few good appraisals, it looks more than adequate to support your needs at present.

I've had quite bad experiences with Modern Pressed Vinyl sourced through the larger supply chains.

Fortunately these purchases are supplied with good returns policies, so it is prudent to choose to make use of this side of the service.

Also a MFSL LP might be a bit more pricey, but can prove to be a good benchmark to compare other vinyl purchases against, when another LP is noticeably inferior in the comparison, returning it and receiving another copy will in most cases prove to be a corrective measure, where a noticeably improved LP is received.

Avoid buying discounted copies of a New Release LP from larger supply chains, as these are possibly items that are already returned by customers.

The TT Belt on your TT, is claimed to be a Silicone Material, is there any sign of a wetness on the belt, as a Silicone Oil residual can easily create a slippage.

The TT's motor is a design that is very accurate for speed stability and I doubt if it has a fault, but maybe should not be ruled out.

The Stylus being quite dirty can cause a replay to sound quite distorted and unenjoyable, or worse a damaged cantilever can produce a replay that sounds very incorrect and concerning. 

It looks like there is a bit of hill to climb, to get you to the place where the Vinyl side of the system, is proving to be quite satisfying.            

Goofy, I don’t get the impression that some LPs play fine, just that some are less objectionable than others.

I reviewed the Marantz TT user manual. Since Marantz sells the TT, the phono cables, and the Virtuoso cartridge as a package deal, it seems unlikely that cable capacitance would be an issue, although the Zen has a highish input capacitance, and I can still easily imagine the cables add 100pF. However, the OP needs to check out setup first, VTA, VTF, grossly accurate alignment. As I inferred above, one possible way to ameliorate the effect of the high capacitance load on the cartridge is to reduce the input resistor load, which is to say reduce its value which paradoxically increases the load on the cartridge by a tiny amount. I still think it would be worthwhile to try 33K ohms. The only way to do that with this rig is to insert a resistor in parallel with the fixed47K load. This can be done with the inexpensive kit sold by DB systems.

i just looked up the loading kits made by DB and sold by Acoustic Sounds. It’s mainly for MC cartridges, but they do include a pair of blank adapters that could be used for any value needed.

You have a decent turntable.  I owned a Clearaudio Emotion for quite a while and it is very similar to your table.  You have a really cheap phono stage.  

Here are a few suggestions.

Try getting a really thin sheet of sorbothane and setting the motor on that.  Thin being the key, if it's too thick the belt may ride too high and come off the platter.  The sorbothane can leave stains on things, so take that into consideration.  Blue tack might work.  The thing I least liked about my Emotion was that the motor could move around.  The sorbothane really helped.

Don't be afraid to give the platter a little spin and give the motor a little help to avoid the belt slipping.

The ticks and pops become less noticeable as you get better gear.  People are often surprised when they hear a really good analog setup and it's dead quiet.

Many new pressings have a lot of ticks and pops.  Static electricity can also be an issue.  Cleaning records can help with this, and there are devices that are purported to reduce static (I haven't tried any, so won't comment on their efficacy).

There are places you can get information on the quality of different pressings.  The Steve Hoffman forums are one and you can also look up the release on Discogs and see ratings and often there will be comments about the pressing quality.  Unfortunately, it's often a crap shoot - one person will get a great copy and the next person will get a poor copy.

If you are open to an upgrade, check out the Parks Puffin.  I think they are under $500 new.  It's a great phono stage at its price level and has a "Magic" setting that will reduce clicks and pops.

If you have a hi-fi shop nearby, take the table in and have them check your setup and the cartridge.  That shouldn't cost much.  

Thank you go all of you who have responded to my questions - it's been a tremendous help.  I wanted to provide an update and, perhaps, ask one more question.

I tried a different cartridge (Rega Super Elys) that I picked up here on AudiogoN for a reasonable price - just to rule out any issues with my cartridge.  While it sounded "different", it certainly wasn't better and most of my issues persisted.  I took that to be good news.

Next, I tried another "budget" phone preamp (a Schiit Mani, also picked up here on AudiogoN), to rule out any issues with my iFi Zen Phono.  I figured that if I bought stuff cheap enough, there was little to no risk and the troubleshooting could continue without spending needless money.

In the meantime, I followed all of your advice and walked through the setup process of my turntable again. I'm not sure if I heard any improvement, but it helped me feel confident that I had done things properly.

All of this lead me to the conclusion (as many of you already pointed out), that I needed a "real" phono preamp - something more in keeping with the quality of the rest of my system.  Against my better judgement, I got on eBay and bid (and "won") a Lehmann Audio Black Cube SE.  Unfortunately, there was something loose rattling around inside the external power supply, so I didn't even risk trying it out and promptly requested a return authorization.  Next, I purchased a Dynavector P-75 Mk3 for a very good price and was optimistic that it would be "the one".  Sadly, I experienced a terrible ground loop that I absolutely could not eliminate, leading me to conclude that there was an issue with the unit itself.  The seller hadn't used it in a few years, so couldn't rule out that there was a problem.  He kindly refunded the purchase and I sent it back to him.

Finally....I purchased a Musical Fidelity M1 ViNL phono preamp from a very nice seller here on AudiogoN which arrived yesterday.  I promptly unpacked it, marveling at how substantial and beautiful it is.  I hooked it up directly between my turntable and control amplifier (integrated) and put on the first record.  It was a revelation!!  This thing is so quiet and dynamic, it's amazing!  I have lots more listening to do, but I can finally hear where vinyl is "as good as" a nice digital front end and clearly has the potential to beat it. 

All of which leads me to one more question, if you will indulge me.  As you may recall, my cartridge is a Clearaudio Virtuoso which is a ~$1,000 moving magnet cartridge.  I would like to try moving coil but am wondering whether something "affordable" like the Denon DL-103 could possibly equal or better the Clearaudio, or is that unrealistic?  If so, what would I need to budget for something that would clearly surpass the Clearaudio - and do you have any specific recommendations?  I like to keep it under $1,500 if at all possible.  

Again - I want to thank you all for your thoughtful replies and assistance.  It's been a struggle and, at times, incredibly frustrating, but I feel like I'm seeing some light at the end of the tunnel and am looking forward to buying more records and actually enjoying my investment.