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Dew management - at least in Brisbane's climate - is pretty easy to deal with using a separate heater tape (not one integrated into the dew shield) and correct placement. I find placing the heater tape just behind the thick metal band that holds the corrector on the ota itself is very effective.
Mars and Saturn were both pretty high up this year and not once did I have to pack up as a result of dew.
There was a thread on CN a couple of years ago plotting the contrast function and the detriment of the differing sizes of obstruction. The 34% obstruction appeared to cause some boost to some contrast features that more or less correlated with atmospheric details on Jupiter. I'll see if I can dig it up...
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