Hi there. I have a vistaflame insert. I have noticed that sometimes with certain pellets the flame always leans back towards the fire brick liner and hopper chute. Because of this the line is partially cracked. It is covered under warranty so it's not that big of a deal. I have tried to adjust the damper to control the flame. It helps for a bit but then the flame always eventually bends back. It is mostly with barefoot pelets this happens. Anyone have any input?