Is ash amount strictly a result of the brand of pellet used ? I am burning Maine's Choice, and get about a cup and a half of ashes per hopper full. I'm a newbie and would like to know if that seems about right or can changing brands make a difference, or changing stove settings, 4-4-1 on my Englander 25 at present, burning clean and plenty hot at those settings with no unburned pellets. Thanks for any input.