Hi Malcolm,
I had the same occasional problem; when the mount needed to only move a few hundred pixels it would not move much at all because of backlash. It was not an issue when the needed correction was larger. Hypertuning my AZEQ6 solved this fairly well. Maybe try to tighten the gaps a bit as per AstroBaby's EQ6 strip down guide?
Since I got Mach1 I am each time impressed how it perfectly responds to such corrections in SGP - after initial PA and plate shoving it only needs one correction and gets the target centered consistently to within 1-3pixels from previous' night's session.
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