Dave, I have not experienced that at all, and I have tried just about every possible combination of e.q., processing, reverb, delay, compression, and gate.
I've found best results to be just a little reverb, almost zero e.q. (in other words flat). I have compressor and gate off. Most of the time I use EV PL84 phantom powered condenser mic. I have also tried Sennheiser 855, Shure SM58, AKG, Samson Q7, Audix OM5, Peavey, EV 967 and a few more. All of them sound good with some adjustments to fit the mic, but the best of have been the PL 84 and Sennheiser. The SM58 sounded surprisingly good (really warm), but had too much handling noise in the bass end of the spectrum.
I will try to duplicate your problem when I get a chance.
DonM
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DonM