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Hi David,
What magnification are you looking at Jupiter with? It may be there is nothing at all wrong with your collimation. If you are trying to pull too much magnification out of the scope, it's going to disappoint. While in theory you should be able to get 400X out of it, this theory does seem to have a limiting factor. On all but the best of nights I find it hard to beat around 250-300X. The atmosphere is the limiting factor, not your telescope.
Clear skies,
Shane
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