Stuart I like the Ha image myself, guiding looks great as I would have expected. I suspect that like the GSO RC's collimation needs to be undertaken on the outer side of focus and it can be a bit fiddly. Mind you now that you have the pointing of a great mount , it should only take half an hour. Even an hour of fiddling is going to be better than images you will be less than please about.
Having said that, the images look superbly detailed even for slight mis-collimation.
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