Takes some experimenting. I've been burning for 10 years with that Enviro 1200.
Three things make a huge difference:
- dry wood. Some of my wood was split and stacked six years ago, topcovered with lots of air flow
- don't overfill the stove. I put in a couple of medium size splits and a couple of small splits on top. Paper, maybe some kindling, cedar scraps. Top burn to start
- start slow and let the fire establish itself. When I start a fire I leave the door just slightly open, then over the next 10-20 minutes gradually close the latch down. Then, if it's well established I close the air control half way. Give it a few minutes. Then close it down the rest of the way. As you do this, watch the flames. You'll be able to tell if you're choking the fire...if so, open the air flow back up
I've tried stuffing the firebox but that doesn't give me great results. So I leave a good amount of air space and add logs periodically. Don't try to keep the stove at full burn all the time, or at a constant stove temp. Feed it, set it, let it burn for a few hours, then add a couple of logs and rebuild the fire. Ebb and flow.
Also, a good stove top thermometer will help you to monitor where your stove is tempwise. Tough to estimate...
Hope this helps.
Remember, every fire is different...which is great for people with ADD. Just saying.