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Hi Mark,
Interesting comparison.
The greater the magnification you use the greater is any slight error in collimation and focus also magnified.
At very high magnification any air currents in your scope tube or in the boundary layer of air in contact with your primary mirror are also magnified.
To get good results with the powermate you are probably in the realm of Peltier cooling, at least the image scale for your scope with the powermate, still fits Jupiter on your chip.
I use a TV 3x Barlow with a 30mm extension which delivers 5.3x in my optical system.
Good Luck with it.
Regards
Trevor
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