Hi Peter,
I had a similar issue with the stock focuser on my ED80 when I upgraded to a QHY9M+FW+TS FF. I could get the draw tube not to slip but had to nip up the tensioner quite a bit. This made the entire focuser movement quite tight. In the end I came to the conclusion that the focuser was operating at the limit (maybe a bit beyond) of it's payload capacity. So I upgraded the focuser of the ED80 & ED120 and this really solved the problem. The draw tube no longer slips but the travel is smooth and not tight. Also there is a 10:1 control which is coupled to the stock motor I have been supplying with the SharpSky kit.
Obviously, MoonLite focusers are in a different league but the budget wouldn't really stretch to two of these beasts. The motivation for making the SharpSky controller pin compatible with MoonLite was to permit an easy upgrade path from budget stepper motor and bracket to MoonLite/Robo. However, now I have motors and brackets fitted to my scopes the focusing performance is great so will stick with the current setup.
I think like many people I'm not sure how I managed before fitting remote focusing - for me it certainly makes the imaging experience more enjoyable
Cheers & clear skies,
Dave