Hi Wayner,
Although its a long time ago, I came across the anti skate problem discussed here. I own two Technics SL-1200Mk2 and today arrived a brand new Audio Technica AT LP120-USB. It came fresh from the box and shows the following flaws;
The anti skate problem, exactly as you described happens on this one
The motor made some noise, it is much quieter now as I allowed it to run in for a few hours
The speed at 45 rpm is not spot on but a bit too slow, 33 rpm is o.k. Not a big problem but it should be spot on.
The tone arm, despite at its lowest point, 0, sits still too high, so cannot be set horizontal.
It is obvious this product can't even stand in the shadow of the SL1200 but I have bought it for digitalizing and to serve as an extra player in the room where my records are stored.
I have tried to see your pictures regarding the modification you made, but these pictures are no longer accessible. I don't want to go back to the store as all will show the same problems I fear.
Kind regards from Holland!
Willem.