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Don't forget Saturn! It's up well before Jupiter and it's always an impressive sight.
You will really need a good collimation tool (cheshire sighttube with crosshairs) and a centre spot on your mirror to get such a fast scope properly collimated. Start test at this stage may be futile if your secondary is not precisely aligned. But I guess it can't hurt. At least with the short tube you should be able to reach the primary adjustment screws while looking through the focuser.
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