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Stellar profiles still indicate to me that your collimation is way off. Possibly focus too.
I would think that your 10" f/5 would produce better images in much less time than the rc.
Collimation is key with those rc's, I bought the first one sold in Australia to my knowledge and to my knowledge it was the only one that arrived collimated. I never touched the collimation and never had problems. I did some modification to the focuser and it easily held my sbig st10xme and cfw9.
If you have collimation issues I personally feel that the TAK scope is the answer. It's pricey but it's a problem solver.
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