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Celestron SCT have significant backfocus, what exactly have you got between your OTA and your eye piece - for instand do you have a 1 - 3 " extension tube and or a 2" - 1.25" barrel convertor?
My C9.25 has a Meade Motot focuser, a huge Lumicon OAG, a 2" barrel entension then a canon camera adapter and finall y a Canon camera - focus is trivial for me - so I ponder is your eye piece too close to your OTA?
Didi you have a diagonal in your moonlight focuser? Maybe post a picture.
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