Thank you everyone for your responses....they were all very helpful.
What I ended up with was actually a simple solution...I modified an extension cord (with an earth-ground) by removing the +/- wires, leaving only the earth-ground wire. I attached that to my frame and it took care of everything....there was just too much static building up on the frame.
With the transformers running and the metal frame grounded to earth, my Arduino and sensors work perfectly.
There will be a warning sign up for people with pacemakers....good call!
Thanks again everyone!