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Peter,
I'd be concerned at the pixel size of your guide camera. The qhy from memory has around 5.4 micron pixels, and it does not support binning. Im guessing that is why you bouncing around so much. The image scale of your guide camera is off the charts.
From my experience I found that I run my guide camera at bin2 (bin 1 is 7.4 micron) under a meter of fl and bin 3 for over that. I once made the mistake of trying to guide at bin1 at 2300mm. What a mess that was, just by changing the binning to bin3 settled it right down.
Brett
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