Tweaked the gains a little more and while there is still some noise, it's at this point reduced enough, coupled with the fact others have had some noise out of MiniDSP units, that I am fine with it. It could have been gains all along, but (and without hearing it in person, it's hard to describe exactly) there was more noise than I would have imagined going from 4V to 6V..... moving on.
Next step is going to be trying to mount the remote somewhere in the car, I am hoping to be able to flush mount it beneath the armrest with only the buttons showing. This piece of felt covered plastic:
Sits on top of another piece of plastic that is part of the center console. The hole you see is from when I had a bass knob from the PDX-V9 mounted there. I am hoping to be able to mount the board to this felt covered piece, trim the plastic piece that is beneath here and then just sort of drop this piece down into its home. It worked for the V9 bass knob, so other than having to remove some more plastic should work for this as well. The biggest thing being making sure it does not fall off, I think (and hope) that the nut that is beneath the volume knob will hold the board tightly to the felt piece.
The remote is fairly bulky:
Especially when looking at how big the guts of it are:
Here is a picture of the back of the piece I need to cut the holes for the buttons on, the ridges are actually a pain in the butt for cutting it easily. I want to cut from the back ideally, but those ridges make life difficult. I am likely going to cut the 4 preset buttons as a single hole, I don't think I can cut out the individual squares neatly enough nor will the plastic strip between them be particularly sturdy.