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It could be that your scope is not reaching focus. My 8 inch Dob (a GSO/Bintel) will not reach focus with most eyepieces.
What I've always had to do was either hang the eyepiece way out of the focuser tube, just enough for the focuser to hold it (very dangerous and not great alignment), or what I've done for quite a while now, permanently leave a 2 inch diameter, 35mm long extension in the focuser and fit the eyepieces in to this.
I've never understood why a telescope would be sold without the ability to reach focus, but that's how it is.
Ben, just try moving the eyepiece as far out of the focuser you can with the focuser still able to grip the eyepiece. Rack the focuser all the way out, get your bright blob in the middle, then gradually rack the focuser in. See if that helps.
Cheers,
Jason.
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