I have recently started using AWF softies after burning a half ton of "power pellets" I now notice a very slight wisp of blue smoke out of the exhaust even when the stove is up to temp and on max burn. I tried setting the feed rate using the 1 inch ash bed method, which gave a setting of 4, then backed it off to 3 .... Still seem to have the problem. I checked all the seals on the door and ash bin, there are no intake or exh blockages. I cleaned the burn pot thoroughly but the problem persists. This is my first full year of using a pellet stove so I don't know if this is caused by the pellets or if there is something wrong with my stove. I just had it installed last spring during the shoulder season. I've also noticed that the side glass area where the harman advances typically get dirty is now black instead of grey as it was using the power pellets. Any one have an opinion on this?