Whether you have enough vents depends on how many chickens you are keeping in that coop. As I said earlier, it is suggested that you have 1 square foot of vent area that is never closed for every chicken. Measuring your vents and considering the number of birds you have should give you an idea as to whether you have enough vent area. How many chickens do you have?
To give you an example, I have an 8' by 6' coop. I have 2 1' by 3' vents. Also have a 2' by 2' vent and a 1' by 1' vent. This coop was built for 12 chickens but I am only keeping 5 now.
I will add that my coop is not insulated and I live in Montana. Have never found a need to have it insulated. I have always felt that insulation is just a nice warm place for mice to spend the winter. Chickens do well in winter if they have a well ventilated coop and are not subject to drafts and wind. In other words, vent out all that moisture and give them a place where no wind blows on them.
I have never had an issue with wood parasites. Coop is about 6 years old.
I also liked Kafen's suggestion. The temperature sending unit I have in the coop also checks the humidity. Always nice to know the temperature and humidity in the coop by checking the base unit on my desk.