Thanks for the info/sound clips Dave. I actually had the lug going to bare metal at the point in the picture but the chamfer on the internal threads going to the floor is so big that the lug didn't have much of a contact surface (see post 32 & 33) to the floor. I still had dimming with this but it's also with the gain on the amps turned up to halfway so I guess that could have been the issue. I guess one of the reasons I had the gain turned up so much was because once you get pass 23-24 on my HU it makes the midrange sound jump up (I don't know if that makes sense) so I had it to where I only would go to 22 max and not reach that point.
So is your ground to an existing bolt under the console?
I'll reset my gains in the next couple of days and at least take out the washers on my grounds if not move them to the area you told me of.
Thanks again for the info.