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Steve, I noticed you have the same mount as me an EQ6-R pro
Your ED80 with all AP gear on board should only weigh around 6 or 7 kg on a 20kg class mount ( 15kg AP recommended max payload )
I’m carrying 15kg on my mount ( 8” f5 newtonian ) which is nearly maxed out and on good nights my mount can guide around 0.65 arc sec total error ( 0.45 Dec and 0.55 Ra approx ) Nights of poor seeing around 1.30 to 1.40 arc sec
Admittedly I have adjusted mount to reduce backlash and tightened the Ra and Dec belts a tad bit, but out of the box you should be guiding around or under an arc sec with this mount
Balance is super important in Dec and Ra ( slightly east heavy as Adam pointed out )
There’s no reason if everything is set up correctly both with mount and guiding software that you can’t guide under an arc sec with a lightly loaded EQ6-R pro
Alternative guiding software won’t fix your problems if it’s your mounts balance or your guiding software set up correctly
Happy to advise further if you wish
Cheers
Martin
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