Mick,
Changing the guide rate probably won't help you unless you're guiding very slowly right now (and are too slow to keep up with the errors in your worm). For your rig, bump up the calibration step size though to 2s or so to let it calibrate faster and drop the min motion way down to something like 0.1 or 0.05 as it won't take much motion on that 100mm guide scope to translate into real error.
Craig
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