Had no real trouble you would get my little attack wrong
Of course the sub is a problem (therefore my frequency suggestion).
The slip mat issue is interessing.
I do not use butter rags or so, but I always carry various felt mats around (even some "self made" - thick & soft); and changing could help a lot regarding feedback / noise issues.
Regarding the center hole I have to put a bit blame on MV. About a third of my vinyls have a hole that is too large which could be very nasty when moving the vinyl back and forth to match down beat.
With SSL and NI I do not see this lower quality, with Torq it's even worse. Some Red vinyls I ordered were simply not usable, because the whole were nearly 1mm to wide (!) and sometimes the label touches the last grooves... made a decorative bowl for fruits out of them
and so had a funny gift for a friend.
A beer shower is bad. I try to avoid that someone finds a place to place a drink on "my" table...but there is always a little whole between the cables...grrrrrr