when you say it moves when you "switch leads", do you mean when you swap interconnects from the table to pre, or when you swap cartridge/headshell leads? I assume you mean the former, and in that case I would suspect a poor connection at the headshell (ie as the easiest to fix issue), if it's not that, then it could be something in the tonearm wiring. I would start by double checking a good fit of your cart/headshell connects.
Loud hum in one channel
I just finished setting up an Empire 598 III turntable, and, unfortunately, am getting a fairly loud hum out of the left channel, which will happen on the right when I switch the leads. I am using a Sumiko Blue Point, and the ground wire is connected. Any help on solving this would be greatly appreciated!