You must get this http://www.ebtechaudio.com/humxdes.html !!!!!!
I should have posted about it before. This instantly solved my problem. I've even had sound guys see it and ask me about it saying they wish a bandmate had something like that for their rig. Everything is still grounded, but somehow this filters something and the super-annoying hum is gone. Instead of using it for your whole power supply, you just plug one amp into this. They're around $65, and it was totally worth it for me. The stereo sound of the Timefactor is a must!
