What sort of RMS are you getting when things are performing not-so-great? And what's the FWHM in the resulting images? You might find that you simply don't need anything better at your image scale. Having said that if you really do need to be constantly tweaking it, I can understand the attraction of acquiring a better mount (I assume that's where this is heading).
I definitely tweak the aggression and min move based on current seeing conditions. I don't usually do it throughout a session though, unless things are clearly not right. I usually just set it up at the beginning of the night and as long as the corrections look good I leave it be.
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