Do you have a dedicated fresh air supply into the stove? If your house is pretty tight, you may need the stoves own fresh air inlet. Mine worked OK for the first month or so, but had a few backdrafts in the middle of the night due to not enough oxygen fed in box i think. Coals were lit, but not enough heat going up the chimney to keep a good draft. Scares the crap out of you when carbon monoxide detector goes off at 3 am. Cut a 4" hole outside, hooked 4" duct up to back of stove, and good to go. I do have some issues loosing draft if I don't keep a good fire going when really cold, or starting it up initially some days.
Blowers will help get more heat out of stove. I added one a couple months in. Spendy sucker, I think $200, and they gave it too me a little over their cost, I bought stove on clearance for $300. Try it without, and see how it goes.
Black soot on door glass happens, usually if I am in a hurry and don't have fire stoked real good in morning, also wet wood. I leave the door cracked for 20-30 minutes and get fire rolling good and then close up. If coaling up bad, I will just leave door wide open for a couple hours until they are burnt down. Really throws some heat out, and not worried about creosote buildup with red hot coals, usually on really cold days when temps are single digits.