Well, my friends, this definitely isn't gospel, but it seems to work for me most of the time these days. Goodness knows I've had problems getting dependable chicken, but this approach is getting me closer.
Brine your chicken pieces for one hour in 2 quarts water or apple juice, 1/2 cup non-iodized table salt, and 1/2 cup sugar (sugar is optional - Cooks Illustrated leaves out the sugar these days, even with a brine this strong.) Rinse well after brining, towel-dry well, and then let sit in the fridge overnight to dry.
If you don't have time to do the fridge thing overnight, then after you towel-dry them, lay them skin-side-up on one half of a heavy doubled-up bath towel, and flop the other end of the towel back over the top of the meat and gently press down to absorb all the water you can. Flip the whole thing to skin-side-down, using a dry towel if necessary, and press down again, letting it sit for a few minutes this time. Lay your pieces skin-side-up on a rack on a baking sheet, and set the whole thing in front of a small fan on your kitchen cabinet while you go get the fire ready. By the time you're ready to rub and cook, you should have significantly drier skin. I do the towel/fan approach on a regular basis since I usually don't think far enough ahead to have time to let it sit in the fridge overnight.
When I do chicken pieces in the WSM now, I'll either use an empty waterpan with foil over it, or just leave out the waterpan completely, and let 'er rip full-blast right from the start, with a probe in a couple of pieces to monitor the progress. This is how this sort of chicken usually turns out, using cherry pellets for smoke. Ignore the hand - that's my husband Robert, whom I caught red-handed filching my prettiest thigh. This particular batch had no sauce or glaze of any kind painted on because i was experimenting with skin reactions, but I HAD rubbed a little seasoning in under the skin to augment the flavor-brining. I think I used apple juice in the brine for these.
YMMV
Keri C, smokin' on Tulsa Time
(who still can't make a short post to save her life...)