The issue is that you have to take into consideration the ambient temperature and your RH%.

I mentioned it in another thread, but I'll mention it again here.: 70% RH at 70 F is not the same as 70% RH at 80 F. There is going to be more moisture in the air at 80 F, because warmer air "holds" more moisture VS cooler air. In other words, you're still holding steady at 70% RH, but it's 70% of more moisture!

Were the sticks that had burn issues stored in that fermentation chamber? If so, then yes, I'd try a lower RH. Want me to mail you some 65% Boveda packs?