If you are running charcoal - be sure its a dry source and not from a partial burnt portion.
If the charcoal isn't hot enough- try lump... burns hotter.
If you're working with wood - seasoned oak splits will answer your need.
Keep that flue open for the cleanest smoke and better flavor too.
Custom Klose Backyard Chef... of Snot, and a 22.5 WSM
Lang 84 Deluxe kitchen, Lang 60 Mobile - The Damsel II, Lang 48 Patio - The Damsel, Bubba Keg Grill - RIP, Double Barrel Smoker and a BSKD