Ozzy,
Counted up the number of HFT's on the walls and ceiling and the count was 15. In my system the additional 8 on the speakers and 2 on the SACD player was beneficial but not critical. It sound like your room is "dialed" in. I would consider sending the two sets of HRT's back and auditioning the FEQ Unit(High Frequency Equalizer Unit). This will tightened up the bass and lower the floor noise. I very much like the combination of the HFT's and the FEQ. By doing different things they are quite complimentary in their effect.
Counted up the number of HFT's on the walls and ceiling and the count was 15. In my system the additional 8 on the speakers and 2 on the SACD player was beneficial but not critical. It sound like your room is "dialed" in. I would consider sending the two sets of HRT's back and auditioning the FEQ Unit(High Frequency Equalizer Unit). This will tightened up the bass and lower the floor noise. I very much like the combination of the HFT's and the FEQ. By doing different things they are quite complimentary in their effect.