I've got a snp that a friend gave me a couple of years ago. so far, i've just used it as a grill, and even then i've had problems keeping the thing hot. since i'm wanting to start smokiing i read just about everything about this smoker i could find herre and elsewhere. what are the best mods to do to it for heat control, the baffle and extending the stack downward? is there anything else that needs to be done to make it work right?