I've ran my new WSM twice now to just get the feel for it. No meat. I'm using minion method with Stubbs briqs. Half chimney of lit on top of unlit. Ran it for about 4 hrs both times. Zero problems maintaining temp. However, both times I tore it down to clean it out the wood chunks, hickory, we're not consumed. They just looked like coal. I was expecting them to be fully consumed or at least down to coals. Was running it at 250 (lid therm) both times. The chunks were touching lit coals almost the entire cooks. Is this normal? Chunks were bags from Lowe's, Cowboy I believe.