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Too much of a good thing maybe. Asssuming all else was the same, you may be getting too much light and its overwhelming the ability of the eyepiece to distinguish detail. Try a little less power. Around a 10-16mm EP should be more than adequate for the longer focal length.
Also, and since I've never owned an SCT I could be wrong, but the central obstruction tends to cause a minor loss of detail compared to refractor.
G'luck.
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