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My C9.25 has a bit of mirror flop so I opted to get a crayford 10:1 focuser for it. As others have stated, I do a rough focus with the scopes original focus knob and then use the crayford for fine adjustments.
IIRC the Meade SCT's have the option to lock the mirror in place but the Celestron scopes do not.
One suggestion though is to occasionally wind the focus from one end to the other a few times to make sure there is grease all the way along the focuser gear, this certainly helps with smoothing out the primary focus.
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