This is a great write up Dan
I bet that AMP could do it even for the fronts to be honest. I'd be curious if you ever connect those up to your front RBHs just for fun some time to see how they do
I really love my Outlaw 7500s but those are ATI amps. I know these are made by someone else but they look great and clearly now work great. I might need to pick one up if I ever find the right deal and try it out myself.
Any differences you noted in input gain vs other AMPs you have had? (if that's the right concept). I've found with some of my AMPs that you have to adjust levels to get to the same SPL and go from there. My Outlaws must have a very good input gain/sensitivity but other AMPs I bought must demand a higher voltage signal as I have to adjust levels up to start out at the same SPL. Of course they do the trick from there. That is the case for the D-Sonic monoblocks I picked up. They must be designed to accept a higher voltage from a Pre-Pro or something.
Anyways, sounds like you have some great equipment now and it keeps getting better which is a lot of fun!