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Mount ratings stated by suppliers and resellers are usually visual ratings not long exposure AP ratings
True the max payload rating on the HEQ5 is 13.6kg but recommended AP payload for long exposure would be more like 60% to 65% or 9kg
I had a 6” f6 GSO newt on my HEQ5 for years doing long exposure AP and payload was around 8.5 kg ( I could never get my guiding below an arc sec on this rig no matter how well I balanced it )
I’d hate to think what the guiding would be like sticking my current 8”f5 GSO newt on it, I upgraded to an EQ6-R pro mount and it guides at 0.70 to 0.80 total on average
For just planetary work you will be fine with the 8” on the HEQ5 but long exposure AP work using an 8” or 10” definitely an EQ6-R pro or equal or bigger
My 2 cents ....
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