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It could be poor seeing, poor collimation or both. What eyepieces are yo uusing? Is your collimation up to scratch? Also make sure the 3 primary mirror clips are not clamped down tight on your mirror as this introduces astigmatism and will ruin the views. Many GSo-type newts often have the clips too tight on the primary. Ideally you should leave a tiny gap betwen the clip and mirror surface, about the width of a business card. You can check by observing the diffraction pattern of a moderately bright star at high power, if it's triangular, you've got a pinched mirror. This can easily be solved by removing the mirror cell and loosening the clips (it helps to put a tick on the cell and tube beforehand so you'll get it easily back on).
You can try a moon filter or variable polarizing filter to cut the glare.
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