Diving into the world of tubes...help needed!

Getting into tubes.

It is very important to define your system needs, think carefully about control options, both manual and remote. Inputs, future additions, ...

Bias Adjustment of Power Tubes: external, easy, safe, is a very desirable feature for tube amps, I wish I had it, I don't. 

I am just now learning about some modern control/input choices, I'm 71, tubes, LP, Reel to Reel, using old school McIntosh tube tuner/preamp mx110z into tube integrated amp, Cayin A88T. (I love the sound of the Cayin, but I may change for a few reasons).

Tone Controls/Balance. I agree with you, controls are important when needed, often just a bit improves a lot. Most important for me is balance, and much preferred is remote balance. I started a thread about remote balance

https://forum.audiogon.com/discussions/remote-balance-control-on-tube-integrated-amp

I don't use treble/bass much, but if I did as you describe, I would also prefer that remote controlled. Remote volume, and mute also.

One option, is to effectively have 2 systems, some equipment direct to tube amp, some equipment thru tone controls, then to tube amp. I use this Chase Remote Controller for a few components, it then goes to my tube integrated amp via it's AUX (any line level input).

https://www.ebay.com/itm/CHASE-TECNOLOGIES-RLC-1-REMOTE-LINE-CONTROLLER-Complete-In-Original-Box/123978156682?hash=item1cddac8a8a:g:0CsAAOSwUHld0Ht4 

It can also be used via a tape out/in loop

As it says, absolutely no noise, Cannot tell if it is in or not in the loop.

Some equipment has tone control bypass options, and some Integrated Amps have tone controls for a few inputs and also have 'preamp in' which skips the Integrated's tone controls.

Those features put you into a modern Integrated Amp. Some, like the Vincent you mentioned, are hybrids, only preamp is tubes, amp is Solid State. I would go tube power as well as tube preamp.

I highly recommend McIntosh Mode Control IF it fits in your setup

stereo/stereo reverse/mono/l to r/r to l/l+r to l/l+r to r. ...

I use this to get my speakers matched. They have presence and brilliance controls, and need to be carefully and properly adjusted. Cassandra Wilson; Richard Burton; No More Tears Duet with Barbra Streisand and Donna Summers help. I find test records are best for TT refinement of Anti-Skating l/r balance.

Above done, if the balance is off a speck, it's the source, and a small tweak can be a magic improvement, not just a 'fix'.

My Cayin A88T was designed in Germany, made in China, point to point wiring. Designed to sound like a McIntosh 275.

Used, off warranty. The reviews gave me confidence. It's price very compelling. No regrets, it sounds terrific.

I took the bottom off, it is incredibly impressive, exceptional build quality, and, the layout allows space for any technician to repair if needed.

Unfortunately, to get 16 ohm taps, I had to get the version with internal bias controls. OP's existing speakers use 8 ohm taps, so finding external bias control should be easy.

Brandon, I don't know how sensitive your speakers are. If the PrimaLuna is powerful enough I'd be willing to bet it's a "keeper" if you try it. I run a PL Dialogue integrated and have owned many tube rigs over the decades. It is the best sounding and easy to use tube amp I've ever owned. BTW, build quality is superb, supervised in China by the dutch engineer-designer. Service through Upscale Audio is very accessible (if you ever need service). Good luck and have fun.

@wolf_garcia Wolf, glad to hear about the Schiit gear.  I'll take a look into the products you mentioned
@eliottbnewcombjr Wow, thank you for your lengthy advice!  I'm no familiar with a lot of the technical measurements that are involved with speakers.  I do not use a subwoofer now.  Say I upgraded to the 936s before I chose an amp.  Could the PL EVO 100 (40wpc) drive such a load well?
As far as remote control goes, I can take it or leave it. I've never had it, I rarely if ever use the remote on my CD player. I just get up and do whatever needs doing :)
Thay Cayin looks nice, may be another one for me to consider.  Although the hybrid approach is attractive to me...power tubes are $$$

@tuberist I don't know much when it comes to speaker sensitivity.  If I were to upgrade to the 936, Focal's site says their sensitivity is 92dB, with recommended amp from 50-300W. Maybe the PL isn't a good choice if I go with those speakers...but as others have said, I should upgrade speakers first.