My new Brinkman 40 smoke n pit was cured yesterday.. but I really struggeled keeping it hot enough. The directions for curing it said 8-10 lbs of charcoal should do the trick to keep it in "ideal" range for 2 hours, then "hot" for 1 hour. I used 10 lbs of charcoal.. and ended up throwing in about 5 pieces of dry apple wood in at various times. That just seems like an awful lot of fuel... or is that normal? How many lbs of charcoal does everybody go thru for a good 10 hr burn? At my rate.. I would need like 50 lbs of charcoal I"m guessing I need some mods to help keep the heat. What is the best and first one?