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I've been mulling over this problem Lee and something Ray mentioned, has led me to offer another suggestion. The fact that you're seeing weirdness even when PHD is not active suggests that maybe your mount is tracking too quickly (or slowly)...
You've tried changing the maximum duration of the guide pulse in RA to no avail, but what about the minimum? That is, how about adjusting the Guide Speed (0.nn x sidereal rate) downwards, to say 0.25x or even lower the sidereal rate in EQMOD. After all, guiding on the RA axis works by either increasing or slowing the standard guide rate, so as to avoid issues with backlash (DEC works differently, which is why an algorithm to correct for directional shift, such as resist switch, is appropriate).
If this doesn't work, try ramping up the sidereal rate to 0.75 or 1 (or more) -- assuming that you've currently got it on the default of 0.5x. Experiment, and see if this helps...
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