I am curious, but on a Jotul Castine f400, how full should/can I stuff the box with wood on the cold start up? I start with a super cedar oak and, maybe, hickory. Splits and kindling, but I find I need to start adding wood about 30-45 minutes into the burn to get up to the 625 range on the center of the stove. I have normally started with about 5 small or smallish pieces of wood. The stove is about 1/2 to 2/3 full.