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How did you check collimation and how long ago?
The scope has a 1000mm focal length, and from photos it looks like the tube is quite short, so it might have a barlow lens in the focuser. Does it?
10mm or 12mm eyepiece would be good for a closer look at Jupiter in that scope. If the scope is half decent and well collimated you should be able to see the two main cloud belts on Jupiter even in poor seeing. GRS in good seeing (when facing us).
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