I can only compare the way your York insert runs compared to my York insert and on mine the #5 setting, with the draft knob set about a 1/4" from the right, the flames are between halfway and all the way to the top of the back brick and about 1/2 to 2/3 of the firebrick wide. The fire just needs air and fuel. If you have enough air, then your not getting enough pellets. I had mentioned the auger light cycles every 7 or 8 seconds and while idling the auger light stays ON for about 1 second , but as you advance in heat level the auger light stays ON longer. On level 3, my auger light stays ON for 3 or 4 seconds compared to 1 second on level 1. Level 5 would have the auger light on even longer. If your absolutely sure your getting enough air than you have to make sure your getting enough pellets dropped in the pot to increase the heat output.
Just my 2cents. Let us know what you find.
P.S. My stove came from the factory with insulation stuck inside the heat exchanger tubes. Must have been sucked in the ciculation fan during a pre-run at the factory. I had to use my vacumn with a small rubber hose to suck the insulation out. This wouldn't affect how the fire burns, just the heat output thru the exchange tubes in my stove.
Just my 2cents. Let us know what you find.
P.S. My stove came from the factory with insulation stuck inside the heat exchanger tubes. Must have been sucked in the ciculation fan during a pre-run at the factory. I had to use my vacumn with a small rubber hose to suck the insulation out. This wouldn't affect how the fire burns, just the heat output thru the exchange tubes in my stove.