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Ice have you thought about trying an aperture mask in the scope, it has a lot of merits on brighter objects , especially the sun.
You don't need all that aperture for the sun . An 80 or 90mm mask on your 10" is all you need.
It has the advantage of effectively removing the effects of the secondary from the scope there by increasing contrast.
You all so wind up with significantly less comatic aberration (coma) and would be working at around f12-15.(depends on the mask size) It like having a high quality refractor.
It also cuts down on contrast robbing atmospheric turbulence of using the full 10".
And if the edge of your mirror is of unknown quality, you remove it from the equation as well . So you are using the best part of your mirror.
You can even uses 3 or 4 masks on the scope, combined adds up to more aperture for planetary use.
For the Sun or moon 1 is all that is needed.
Mark
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