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I find those laser collimators are harder to align than the scope itself. There are several threads on collimating in the bowels of the archives. The softness of the stars at higher powers suggests poor seeing and/or insufficiently cooled mirror, but that's not to say the collimation may not be out also. A quick test is to gradually defocus a bright star at med-high magnification. You should get the shadow of your secondary mirror presenting as a dark circle surrounded by the light airy disk of the defocused star - if they are concentric, then you're on the right track. If the secondary shadow is not centred, then your collimation is out. Others will be able to explain this much better than I can.
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