I used to have a '97 TJ and I had the Polk "dB" component plate 4x6 in the factory locations. I ran 2x50 to the front and 2x60 to Polk dB3065 in the soundbar (I "adjusted" the holes to fit the 6 1/2"). This was plenty loud. I must admit the 200 watt Polk dB 10" in the add-a-trunk didn't hurt, but the sound level should be very loud without it. You might try mounting some tweeter separates higher on the dash. The higher frequencies should improve your soundstage, but you may not want to draw attention.

Have you modified your Jeep for off-roading?