I just bought a 30" Masterbuilt and am brand new to smoking. My question concerns the smoke put out by my smoker. I have to restock the wood chips in the tray about every 20-25 minutes. Is this short frequency standard? I've also found that after about 3 refills, the smoke quits. I tried emptying the chip tray, refilled it, and the smoke took off again. Sounds as if I need to plan on emptying the wood tray after 3 chip replacements???? Also, a lot of the chips are not "burned" thru, they're just a bit charred or blackened. I've tried reusing them, and they seem to work just fine.