seal your doors up to fix the midbass, that will cure that- my 6.5 comps play real well down to around 50hz which is plenty low. You have 2 things to do- first seal off all the holes in the door metal to create an enclosure for the mid of sorts. Then use strip caulking to get a good seal between the mid woofer basket and the back of the door panel when it's on so bass isn't lost between the woofer and the door panel. Do these things first.