When you do a major dash install for stage and image, your ultimate goal is to have the entire sound up and out on your dash. Your mid bass is most likely where you left it, just blended with the dash. Once I got dialed in with time alignment, my doors practically disappeared (way they should be).
my guess is your doors are out of phase with your dash drivers (if you have them wired exact negative and positive). First thing I would try is locating an audio test disc. If I can remember correctly, you can order one from USACI.
Change the polarities on the midbass drivers to phase them up with the dash. Hope this helps !!!