From what little research I did before the purchase, I believe most people seem to Not use the damping fluid. I got it setup just before Christmas so I haven't done much adjustments other than setup the arm & cart. I understand when you say, "Have fun but don't drive yourself crazy" I'm reminded of a graphic equalizer I installed in my system back in the 80's. I found myself up to fine tune it far too often. I came to realize that I was working more than playing within the month and sold it. I may play with the VTA a little just to have the experience..But I don't expect to go OCD over it.
The previous owner had the upgrades done. last Dec. I have a list of the upgrades and receipt but I cannot remember what all the upgrades were. FWIW, the mass is 7.9g for the Zyx
The TT is mass loaded with lead and weighs about 100-110 lbs. Platter is 35lbs. The stand I built for the TT has a sandbox with a maple top plate which the TT sits on.