I think you might have a wolf tone creating boomy peaks somewhere around the G frequency.
A multi band compressor is the tool to deal with this. Tune the lowest band in to around 150hz (probably - but use your own ears to judge). Set the threshold to catch the peaks but let the "normal" levels through. Set the compression ration high. You should have individual faders for each band to help balance out different parts of the spectrum (ie multi band eq) as well setting compression.
A multi-band compressor is a bit more subtle than EQ because attenuation only kicks in above a certain level. That means you can keep the bass end and lose just the boom. With EQ alone, you'd be turning down bass everywhere, even where it isn't a problem, just to deal with the peaks.
Of course, you may need to do a little of both.
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