i like to split a signal, and run it thru a guitar amp, set for breakup, to get distortion in the upper mids and highs....
i roll off the low end on that track, and blend it with the direct, which should be clean and low-rich
my focus would be more in the 400-800 hz range, for what i call 'grunt'
at 100 hz, you will actually get more low end than you think, try cutting a high Q at 150, leave your 100 and 200 just slightly boosted with a high Q again, start with 1db boosts