Congrats on your results!
I experienced the same type of performance with my Infinity Kappa 6x9s. A hard hitting bottom end punch rather than a boom.
For the sail panels, you may have installed too long of a screw (from the lower left/right corner of the door panel?) which is bottoming out in it's hole before touching the sail panel. My panels don't rattle at all.
-Wes
98 SE Sport
