Seemed to have pretty much fixed my problems. Tweeked the worm gears and recalibrated and all seems pretty good. Still a little backlash visible when the mount changes between north/south guiding but well within acceptable limits - not sure I'll tighten it more as I want to avoid binding. I don't know if the new USB3 cable helped with guiding, but the camera never dropped out once all night.
Cheers,
Mark
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