Just in case there's an issue detecting the slew complete, try turning on the driver debug messages and doing a slew and see if there's a message logged for slew start and slew complete.

If you see those messages (I can't remember if they're in by default or if i added them when I was testing a similar issue with my lx90 and the autostar driver) then set the scope to slew over quite a large area that will take several seconds to complete. Then monitor the debug output and see if it reports back that the scope has completed the slew whilst the scope is still visibly moving.

Won't solve your issue but might help determine if there is some issue with reporting slew complete or not.

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