Since that could get expensive for more than just one test load, you might look for some dry hardwood pallets, lumber scraps, or dry dead branch wood, too. Just don't go over-board (no pun intended) and overfire the stove.
But because of your smoke spillage and need to keep the door cracked so long, I still think you have a draft problem as well. It just doesn't add up to somewhat unseasoned wood alone.
Make sure you get that pipe clean, because with a thick layer of creosote in there you could have draft reduction, in addition to what you may already have. From your earlier thread, it seems to me you were too conservative in temps, and closing back the air, probably causing that buildup.
As I mentioned earlier, try to observe the smoke coming from the stack... have you been able to get sustained, smoke-free burns?