Not sure if this is the best place for this topic but. . . . I made a couple mods to my chargriller SFB; sealed the cooking chamber with oven rope, extended smoke stack and flipped over my charcoal tray for better heat distribution. My problem. . . Smoked shrimp last night and couldn't get temp up to 225 until after I was done and then I flipped tray back over and removed stack extension. Any ideas?