Temp just dropped from 275* at 9:35pm CT to 250* by 9:50pm CT. What would have caused that? Low fuel? All the vents are 100% open. I added a 1/2 gallon of charcoal to the fire. I'm starting to regret the water in there -- feel like that's keeping this too cool. Good for my boston butt tomorrow, but from what I've read, need to get those bird fired up at a higher temp. Don't want to use the oven. 100% on the WSM.