Would turning your exhaust up a little more at night bring the RH down?
The higher the temperature the more water vapor it can hold.
That's why when the temperature drops condensation occurs.
I always thought that a up to 10 degrees lower differential during lights out was preferred..well that is totally true. i don't like my day time and nite temps to differ by more than a few degrees. i augment at nite to try an match day time temps. (max 76f)
i'm thinking temps going up at night is not good either ziz.. PM, bud rot?? sumtin.yea i have heard that as well. i try and keep them within 5 degrees or less swing.. last nite it actually went up 2degrees f , i have to get a better temp control on my space heater. RH was 50% tho, so i got that going for me..