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(1) is either poor seeing or the scope is not cooled down, about the only way to fight that is to limit your imaging and collimation to the unmentionable hours just before sunrise, and leave the scope outside from about 8pm onwards to give it the best chance.
(2) is not solvable with a dob, but on the other hand you're not going to imaging anywhere near the
limit with a dob anyway so close collimation is as good as you need.
I guess I should have said that "perfect" collimation only makes sense on an accurately aligned tracking mount.
regards, Bird
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