[billdan (Bill)]

Gooday Chris,

I hope you are aware that with guiding assist turned on that guiding is actually turned off, guiding assist gives you an idea of your raw mounts performance.

So making PHD changes will not affect the results shown by guiding assist. (except for PA adjustments).

Also backlash shouldn't be an issue as RA only goes in one direction (never reverses), only slightly slower or faster.

Hope this helps
Bill
EDIT: Having said all that, 28 arcsecs Peak-Peak sounds a lot for a G11 should be about 7 or 8. Try turning the dart board on next time and watch the stars move and see if there are any sudden jumps in RA causing this. Could be a binding worm??