I have been burning the new F3 CB in the office for a few days now. One thing I see is that started up and up to operating temp, around 550 - 600, the verticle pipe which is four feet into a 90 into the thimble is only around 250 degrees. It is great that the stove and the pipe are giving off most of the heat to the room but I am a little concerned that the stack isn't hot enough. The chimney is exhausting perfectly clear heat waves. Not a lick of smoke. Is this pretty much what the rest of the Jotul freestanding burners see or do your pipes run hotter?