what is the process of tuning the smoker after moding it? i have added a baffle to the firebox tunning plates and ceramic briquettes to the bottom to help retain heat and lowered the exhaust to grate level i know i tune it with the grill empty but not sure what else and what steps to do it in the grill is a char-broil american gourmet also have moved the thermometer down to grate level and center of the smoker