not sure if i have damp pellets or not lately but hear is what i have noticed: i have an enviro fire ef 3 and on highest feed setting i find pellets building up in middle of burn pot and it almost looks like steam comming off them or low layer of smoke this is with damper rod all the way out or at reccomended magnehelic setting of .12 to .13 . gonna keep a bag or 2 in rec room where stove is but safe distance away and see if theburn better after that? eastern ember pellets are are main choice here in eastern canada but might try comfy cozy (less heat but burn cleaner as i read in another post here).pellets i have been buying lately have been inside the store but not sure how long.i am storing them in utility room on pallet but 2 foundation walls not insulated just heat from furnace duct work but its not on a bunch as i use pellet stove.