floorstanders on carpet over concrete

I have my Paradigm Studio Reference 100v.2 in the basement on berber carpet over concrete floor. Initially I didn't use spikes trying to place speakers before spiking them down (as you know, Paradigms are quite heavy and not easy to move around) and the bass "boominess" was very strong. After installing spikes the "boominess" has decreased somewhat, but didn't go away completely. Interestingly I didn't notice that much "boominess" before I installed two dedicated 20 amp. circuits, I guess that the bass extension improved dramatically, hence the "boominess" problem ( what a controversy). So I have a few questions:
1. Is the coupling (decoupling) to the floor is the one to blame? and what should I do about it? granite slabs b/w speakers on spikes and the carpet?
2. Is this the room acoustics? and the bass traps are in order?
Please, help!!! The further I move into this, the more problems seem to surface.