Question UPAS - backlash?

Hi,

I'm having a lot of difficulty getting the UPAS to align (using NINA/3PPA). The Altitude seems to work perfectly, however the Azimuth seems to jump around a lot.

If I nudge +1 at a time slowly, then I see no real updates in alignment. If I nudge +1 rapidly it overshoots. It's almost like there is backlash in the device - could this be the case?

I'm completely unable to use the automated NINA plugin as it times out before alignment is reached (because of the above issue - I assume the plugin nudges very slowly).

I'm using Gear Ratio 2, Speed 1000 as recommended in the manual/guide. My mount is a Rainbow Astro RST 135E.

I noticed someone else on these forums complaining of a similar issue.

As I say, Altitude works perfectly - its only Azimuth.

Any help or suggestions very greatfully received.

Cheers,

Duncan