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Yeah your collimation was brilliant with your Eta Carinae, M16 and 5128..
Do you have the option of downloading a subframe on the QSI583? If you download a small sub frame, maybe 50x50px, your download speed should be quick enough to use it for collimation... Otherwise you could perform collimation using the QHY5... you can take .2sec subs.. just use a fairly bright star at say, mag 4 and that should easily provide enough speed to adjust collimation at near enough to real time...
That dew problem sounds like a real bummer... I remember telling you I'd had issues with the secondary fogging up and you'd not seen it... I thought the heater was the best option to solve it, although I do remember your 4945 shot having some weird star action going on... Maybe fans in the rear cell would do the trick, but as you say, the rotational alignment is critical and I wouldn't want to risk doing anything silly...
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