All - Thanks for the input!!!
I'm thinking that the boxes may be my main issue... They are only about .8 cf each and not ported. The previous box I had was substantially bigger and was ported. It pounded really well, but it was int he cab of my truck and there was no "blockage". I can upgrade the subs, but I think that I'll just build some bigger boxes as a test.
I currently have MB Quart 6.5 components in back and Infinity 4x6 "plate" seperates up front (each set powered by seperate amps). I am running everything through a small Kenwood EQ (which tucks VERY neatly in the center console).I did a full trunk "re-model" with hinge panels and side panels that all of the amps, crossovers and distribution blocks are mounted on. It is a pretty clean setup. I was trying to keep my trunk "usable" and still have plenty of room for my spare and a suitcase or 2. Hell, I even have the cargo net still in place!!!
When I have the trunk open and the system is cranked up a bit, the neighbors are a little edgy. Plenty of sound this way, but when I close the trunk, it just doesn't cut it.
I am taking the rear carpet out Wednesday night to get the windows tinted on Thursday. If I do cut the holes, I was going to cover them with metal screens(thick stuff - not door screen) to ensure that the carpet does not sag. Besides a few sheet metal screws, I was going to use some sort of RTV to ensure that they stay in place and do not rattle.
I am going to replace the head unit within a couple of weeks. This should have a dramatic effect on the overall sound quality/clarity.
Keep sending me some input. Maybe I can combine all of it and get some new ideas. Thanks for the help!!!