I had the same problem this weekend. It rained the entire weekend, Friday was fine and going into Saturday there was some water traveling my tarp RL cuz I was too lazy to add a drip line. But like you I had the misting and woke up with my bag completely soaked! I want to believe it was misting but condensation is definitely a possibility. Curious how people solve the problem, if there is a solution to condensation besides just more venting!