thats with the eq. withought i had one ~16db spike and one ~8db spike. the big one centered at ~37hz the smaller one in the mid 40's. (i cant remember the actual centerpoints or values, but my guesses are close enough for this discussion)
parmetric EQing on a sub has to be the best bang for...
since you have the software to do it, maby you might consider what i did:
make a test disc with tones 10hz-90hz one hz spacing. "waste" tracks 1-9 with pink noise or whatever, and use tracks 10-up for tones. that way test tone= track number for easy refrence. map the response to each tone...