So I add you to the list of guys that say that pitch is not an issue. About as many say that it is, and that I should avoid it at all cost, etc.
New chimney, is definitely not in the cards. Would require either a total wreck and rebuild of what is here, or to block it off and run a new one up to height. Nope.
Smaller? Egads. I wanted BIGGER! ,<sigh>.
My perfect world is to load the box once a day around noon, have enough control to be able to scale back the heat, and enough heat when I want it, to warm the house up in a hurry without having to kick the heat elements in on my furnace.
Wood I get a LOT of, for free, for the cutting and splitting. My major cost is bar oil, followed by fuel and chains, for the saw, and gas for the quad. I don't really care so much, if I have to put a conveyor in to feed the firebox. I want the HEAT!
Cheers
Trev