Hi Mate,
don´t think you´ll loose much THC, but with this humidity it is very dangerous to catch Bud Rot, or any other funghal infection. Ideal would be 50% RH and a Temp of around 20°C first 2-3 days.
Then, depending on the size and densitiy of your buds go on with RH40%. Temps can stay where they are.
On my drybox I have mounted two 140mm PC-Fans to get tghe humitiy out.
If you want to have a look, check my Lowryder 2 Diary, last pics of the last week.
Good luck and happy trails for the rest of the way!👍
Servus,
OimRausch