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Celestron Nexstar 5se not getting sharp focus

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I was out last couple of nights with full moon to view and had my Orion Starmax 102 (4") Cassegrain alongside my Celestron Nexstar 5SE (5") Cassegrain. and the Orion is so much clearer with more definition.  I then decided to check the collimation on the Celestron and it was slightly out so I set it and it is good now, but still not very sharp. I even swapped out diagonals and lenses between telescopes and everyt;hing was exceptional on the Orion but not so good on the Celestron. Does anyone have any suggestions on what to look for or what I can check. Any suggestions will be greatly appreciated.

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