sorry if you resolved this, I've only made it through the first page, but the reason why your midbass may sound like shit is because I believe you added too much Ensolite behind the front drivers. You're only supposed to put a 6x6" or so piece back there to break up the back wave. Anything more will drastically reduce your midbass.
I'm also curious how your interior door handles went back on. I too sound deadened my door panels (and rear wall/rear quarter) with Raamat and Ensolite and I couldn't for the life of me get the door handle barbs (for lack of a better word) to slide back into place. So as of now it's just that one tiny screw holding it in place. And I didn't use nearly as much material as you did.
Sick build btw... on to page 2