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I only have sisalation under the roof sheets in the roll off roof and nothing in the dome. The dome is two pack painted white and helps to keep the heat at bay. It does get very hot in both observatories on really hot days in summer. Above 45 degrees often. I usually leave everything in place and just wait until dark to open the roof to dissipate the heat. If I am imaging I open the shutters about an hour early than I would in winter. Never had an issue yet.
I get rivers of dew at my site too. Every night it is clear there is lots of dew. It is rare that there is not dew. Most nights there is dew dripping off the eave sheets around the house, that would indicate how much dew is about. Trying to alleviate the condensation in the observatories would be a futile task, I have never seen another site with more dew than what I get. I suppose that is what I get with water all the way around me on a flat plain. I run my dew heaters on maximum power in each observatory during imaging seasons and have the dew heater on for over 2 hours prior to opening the shutters. If I don't run the heaters of full power I get dewing on the optical surfaces. To that end I have not seen any really adverse effects so far in last few years with these new scopes. Over the time since 2008 I have not seen any issues with all the equipment that has been on site with regard to dew levels.
Personally, I don't think it is either issues are a problem, but if you want to do something about these two factors then you could put a whirly bird on the roof to keep the heat down and it would also create enough circulation to remove dew and condensation in your observatory. Using something that chews power is probably not very economical, but a solar powered system would pay for itself in no time. With lots of dew be careful about screws and bolts that are not stainless or aluminium. Rust will creep in.
Hope that helps.
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