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There is nothing wrong with using the QC contactors for charging with the PFC charger.  When I first did this, my car didn't have the QC contactors which it does now.  I am going to be switching to using them as it gives me an option to get high voltage DC back out of the Anderson connector without having the car in the "ready" mode.  As to condensation, I suppose you could get it if you got the pack really cold.  I have tried that with the leased car (no use having problems with the one I own) and have been able to get condensation on the outside of the two aluminum access covers under the car.  Removing the covers showed no condensation inside the covers.  It's a lot like when you are using A/C in a very humid enviornment.  The glass might condense on the outside, but the humidity is lower inside the vehicle (and pack) therefore it doesn't condense inside.  If you look at the internal ducting of the cold air in the pack, the bulk of it is directed between the stacks of batteries with the area of the access covers really getting hit with the cold air.  Also, the plastic construction of the rest of the pack isn't going to allow heat transfer to the outside as quickly as the aluminum covers.  The PFC isn't mounted in the car, it's something I can throw in there if I need to use it.