OK, I am new to smoking and decided to get a Brinkmann Smoke'N Grill mainly because I am on a budget and needed to get something cheap (not to mention I just really don't know what is good), and now I am having trouble. I cured the smoker like the manual says. I did use Matchlight charcoal but I started it in a chimney starter before putting it in the pan so it wouldn't ruin the meat. The first few times the BBQ turned out pretty good, now I am having trouble maintaining a consistently good temperature. I drilled some airholes in the charcoal pan, and even put a grate in it to put the charcoal on to give it some room to breathe and the temp still stays low. When I try to add coals to bring the temp up then it gets too hot. What can I do?