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Bathroom exhaust fan dripping water (but i have tried everything!)

I installed a nice Panasonic fan, 110 CFM in a 66 sq ft bathroom. I insulated the box, insulated the duct, the fan is working great. I installed the vent right above the housing in the attic, so it's a gentle angle and a short 3' run to the roof.  All connections are tight with plenty of insulation. Today it was about 45 degrees out, took a shower and drips form on the fan grill as I am showering, and drop down for about 10 minutes. I have tried everything I read on the forums and even installed it just as ol' Tom Silva instructed, but still, it drips! 

There are two things I could think of, maybe the fan is too powerful for the room? Does that even make sense?

Or maybe, even though everything is insulated, the temp difference between the bathroom and attic/fan housing are still too extreme, in which case, what can I do? The fan housing and duct are already packed with insulation. I think I have tried almost every suggestion out there. Any advice would help. Thanks!

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