Hi,
FWIW, I too own the WT Classic V, in my opinion this is a really awesome table, BUT the arm is a real bear to get set properly--
Perhaps looking at the amount of silicon you have in the arm well and going through all the adjustments is in order.
I just moved and I spent an entire morning setting the arm up again-- I am finally in a range that I am fairly satisfied with, but have a little more tweaking to go.
One thing I find extremely important is to do all the adjustments in minute amounts and let the arm settle in the silicon for about 20 to 30 mins allowing the for stabilization :) then checking, listening and rechecking.
If you don't have a copy of the factory setup manual let me know and I can make a copy and mail it to you if you like.
Happy Listening,
~Fx