Is it me? Will I ever be satisfied?

Hey Pato,

 Where do you live. Oregon, Portland, Eugene. Seattle?

Lots of excellent ideas to think about.

If you are in Portland, we have a group called The Audiofoos (because we foolishly spend money on foolishness). Our wives tend to agree.

 If you can find a few audiophiles in your area with whom you can share this great hobby, look them up and see/hear other systems. If you're lucky, you can try a few pieces, etc.

I tend to I agree with- room treatment first.

Go Ducks!

Synergy could be an issue? Has the Levinson 333 been serviced? Might be due? Have you considered upgrading to an 804 D4?  Your gear has very good resale value take advantage of that and upgrade ASAP.

I think dialing in speaker positioning, researching what reasonable room treatments (aesthetics and space constraints should be observed if such things are important - if not, go nuts!) are viable, and try applying these practices to your listening room.  We can’t all be so lucky to have perfect rooms AND top-notch gear.  
 

I would suggest asking yourself what is the least-strong, most-lacking sonic element in your listening experience.  If the answer to this question can yield, after some studious research, potentially viable remedies, try them out.  Those are wonderful speakers.

I find that this rabbit hole induces more grief than enjoyment.  This isn’t a way to live.  You have wonderful gear, it sounds like you have a good-sized room to fill with beautiful music.

This doesn’t have to be a terminal illness. Exercise due care with the speaker positioning, maximize your room’s potential, and keep in mind that the ideal life is something equal-to or greater-than a 2:1 ratio; for every hour you spend chasing your tail, you should spend at least 2 hours enjoying beautiful music.  I know this sounds like proselytizing, and I know getting out of the psychological quagmire is easier said than done.  I’ve been there, believe me.

I think with some reasonable expectations and sensible choices (technically and personally) you could have a wonderful life with music.

Room treatments often give a substantial sonic benefit, often ignored by some  audiophiles.  

Also, it would be very helpful to know what you're sonically dissatisfied with (transparency, soundstage, noise floor, bass tightness...) and which direction you'd like to go.  Would help us to narrow down the problems and solutions specific to your situation.

Acoustic may be just fun experiments at no cost.... Upgrading without acoustic protocol is a rabbit hole....