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It could be partly due to "seeing", ie how clear the sky is, partly due to magnification, collimation and perhaps quality. The eyepieces provided with scopes are not usually the "best". Usually you would not be able to use more than about 1x magnification for every millimetre of aperture (about 200x in your case). On a really clear, crisp night you could push to 2x per mm. The 10mm gives about 120x on your scope. Also as the magnification is increased the collimation of the scope will be more important too, have you checked the collimation since you got it? They could easily get out of alignment during shipping. There are lots of articles on IIS about how to do this. Generally though the "clearest" view will be with the lowest magnification as any defects will not be magnified up.
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