A little history stove has been mostly trouble free since new think it’s about15years old ,two seasons ago replaced pot gasket last year feed motor. Running on medium or high no problem but on low the fire seems to small and sometimes you can smell smoke. Yes the pellet feed is all the way open making the adjustment on high setting also I feel the flame should be a lot bigger on high and medium .Really need this stove to run well on low as that’s what works best for us overnight. Was also thinking of replacing thermal coupler? Any thoughts or troubleshooting ideas would be appreciated.