Plumb bob, this is my first year with a 5036 as well (I got mine last spring). I usually stack my wood in about a third of the way back, but have loaded it completely in recent days when the temperature was near zero. I think one of the main things is to stir your ashes daily with the rake and/or hoe. Generally, I am burning a mix of aspen, pine, and a little fir. For the most part, I didn't split any of the wood I have, but am now splitting much of it as I burn it. However, for that reason, my wood is probably still a little high in moisture content(though I cut standing dead timber and my climate here is very dry).
I have a question for you, did you order your 5036 with the restrictor in the smoke stack? It is a reducer ring that sits right at the outlet of your stove in the pipe before it turns up.