Michael
My HEQ5 has a 6” f6 newt on it for AP and I’m up at 67% payload
For long exposure AP “in theory” you should be no more than 60 to 65% of the maximum payload capacity of your mount
You are certainly overloaded on the HEQ5 for DSO long exposure AP with an 8” on board
All you can do is balance your mount as precisely as you can and image on good seeing nights with no wind around
Good luck with the balancing procedure
Cheers
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