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You mentioned you have tried with both west or east clicked on but generally if PEC worsens it means its pushing when it should be pulling.
So the curve is upside down. Perhaps this is a build issue that got corrected or perhaps there was some other bug on PEC but at one stage for sure PEC was bugged in Sky X.
Tracking my AP140 (similar focal length) with a MMOAG and SBIG STi guider I get guide errors of around .1 to .6. Typically under .4 and sometimes under .2.
2.0 would be huge and would result in eggy stars. The occassional 1.0 isn't so bad.
I am using 5 second guide exposures and aggressiveness set to 4 and CCDsoft.
Greg.
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