ok,have read tons of useful info on this great stove. its my second season with this beast and love it,however am still figuring out the size of proper load of wood. if i load to top of firebrick and pull air intake to even with front lip [ thats seems what the experts say] the stove gets HOT,like 800+ and stack temp over 500.makes me nervous.stove is in cellar so have about 25 of 6in. stainless flue.very good draft. if the air intake gets less air glass gets black, however longer burn time. my wood is really seasoned good,no signs of wet wood! with 4-5 good splits she runs super but only a feww hours [4-5]im in maine, so all good hardwood.i read here if your glass is dirty so is the flue. are these temps normal??? thanks guys