Also, if you are not getting a good bark, it might be that your not generating enough smoke to sufficiently penetrate and coat the meat. You want a rich, full smoke for at least a couple of hours to form that bark. Depending on your system, soaking the wood in water before you add it for smoke can help. Don’t use old moist wood, as that may contain fungus spores. And throw away what you don’t use. Or cut oxygen a bit and extend cooking/smoking time to compensate. Most good books or websites on smoking meats have suggestions on this.