I've been tweaking my Englander's low air and low feed settings to get the best economical pellet burn. Been high and low from 4 through 7 on the feed and always higher on the air by one or two. I'm burning Pennington pellets now. My flame color at full flame is a darker color yellow around the pellets and blends into a light straw color as it peaks out of the burn box about 6 inches. The stove settings are at the recommenced 6-4-1 for this color. I noticed different settings give a different colored flame, what does your best burn flame look like?