Tried and burned blazer Douglas fir pellets last year and they burned great.there is the least amount of ash I've ever had. This year I bought the same pellets,and they seem to burn black and somewhat smokey at times.My glass gets blacker faster, as I am burning a Harman xxv.I do notice more fines and I notice what looks like flat black paperlike disk on the burn pot at times. Has anyone used these and had this problem? Could this be from the fines?