It very well could be the ground because I tried to sand down the metal but it seemed like it had some coating on it or something I'll try to ground it better.

As for the impedance of the subs, they are 4 ohm each and I have them wired 2 ohm. The amp is designed to run these subs in this fashion so it shouldn't be a sub wiring issue (at least I don't think).

Thanks for the advice, Hopefully this will solve my problem.

D