Yea im on the older BKK where it has the sliding door at the bottom, so that was fully closed but the fan was unobstructed it had a clear path to blow as much air as needed.
I used a pizza stone so I have a feeling it was holding too much heat and potentially taking pressure off the charcoal and thus allowing the charcoal to go out too much... will definitely have to try with the factory difusser, do put water in yours? or is it dry?
yea i think this was the problem, it overshoots the temp and the stone held so much heat that by the time the temp is coming down the coal is pretty much out so the fan has to work extra hard to get it up again and then just overshoots it again.
i also think the flameboss programming could be better.. it seems to wait too much while the temp is dropping even if it overshoots the temp.. so say i'm targeting 225 and it overshoots to 255, it won't kick in the fan until it's at like 220, well the temp already dropped 35 degrees by that point... in a BKK to drop 35 degrees when you're that low already you have to have like 0 heat production in the keg... so i think if the flameboss program did some little bursts of air even when the temp needs to drop it could keep the coals somewhat lit better so that when it did get to 220 it wasn't so much work to get back to 225.