Risk of bud rot with these conditions?

your plants are well-spread and lots of airflow through them. as long as your circulation is good, you are low risk. that shit floats in the air, so if it's in your outside garden or a neighbor's etc... it's still possible even in ideal conditions. good gas exchange, good circulation... all you can do. 65 is as high as you want to go. if not important to VPD, i'd run a bit lower, but 65 is fine. if my temps were sky high, i'd prolly push my rh as high as 65.