I have tried two different brand of pellets this year.... The current brand New England Pellets; many people I know are burning them and they work great... I have tried mine twice this morning and I don't even get smoke... Igniter is bright orange... My burn pot and liner are as far forward as they will go... I just think the tube is too far away from the liner and the heat from the iginter is escaping before it reaches the pellets...
OR your stove is not pulling enough air in through the air box. All door and ash pan seals need to be looked at.