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Ian
I am certainly no expert on collimating SCT's but I would assume that similar principals apply to them as apply to Newtonians. Firstly collimation becomes "harder" as the focal ratio decreases. This means that you have to be more finicky and careful collimating an f4 scope than an f6 one. A 6SE is f10 I understand, so it will be quite tolerant of slightly off collimation. Secondly, the exact purpose of collimation is often misunderstood. It's purpose primarily is to ensure that the zone of maximum illumination of the image is centred in the focuser so that as much light as possible is being used by the eyepiece or camera. So being unable to get really good focus is almost certainly not a result of any collimation issues.
The poor image you are seeing is far more likely to be the result of poor seeing conditions, and given Jupiter (which is having a very poor apparition ATM for we unfortunate Antipodeans!) is the target, that is extremely likely.
Cheers
Malcolm
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