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As Jethro says it could be a combination of things but I'm sure that if the seeing is good and you let your eyes dark adapt you should be getting some very fine viewing through the 10".
You should be able to turn the front end (large end) of your finder scope to reach focus. I have 3 skywatcher/Saxon scopes and I remember my first view through my 8" absolutely blew me away.
I don't think with the collimation being just a little bit out would have such a big impact.
Recheck your collimation during the day and make sure every thing is tight and have another go on a clear night.
It may also have been that there may have been some light thin whispy cloud up high which will degrade viewing.
Cheers Daniel.
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