Same results in my round stove Lee. I've been putting a layer of nut on top of a healthy burning stove size bed too, and it tends to "cool" it down a bit. Like when I'm going to bed. Because I don't want to waste the stove, and we'll be under covers, I top the fire off with nut through the night. Preserves the stove size, and keeps the temps lower. Plus it's suppose to burn longer. I don't recognize that tho, cause in the AM, no matter what, the barrel tempts always about 400°, and the klinker door is grey. So I poke her down, top it off with nut, and head off to work. When I get home, I'll do the "full Nelson" shakedown, and load her up with the size the weather dictates.
So I guess the "theys" have taught us right, in that dept. Lee.