Welcome @Trichomee !. This is a great community with alot of good growers for any medium. For a first timer, hats off to you,you are killing it! Great work. As far as bud rot goes it is always a threat with heat and high humidity. You said your rh is avg of 40% so you should not have any problems. Is this your rh at lights out? Bc thats when its highest for sure. If you can lower temps a bit that would help reduce risk as well. Again welcome!
If you are interested in lowering temps in your tent could you possibly move your drivers outside of your tent? From what you shared that is something I would consider. As for RH you are good I run higher with out issue.
Welcome to the community Grow Bro and excellent work! I wouldn’t worry too much seeing as the RH is 40%. You could always lower one of the circulating fans to blow under the canopy this way you’ll have above and below the canopy covered. Well done on your first grow