Nice to finally discover the root cause, I'll bet.
I had a similar experience last night when I re-adjusted the backlash on the RA of my G11, and suddenly the guiding settled down and I finally started to see round stars in my subs. I've still got to get to the bottom of my guide camera drop-outs and some odd autofocus results though.
Fun, this astro-imaging, isn't it?
Cheers,
Andrew.
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