Don't know if you'd like a judge's input, but here goes anyway...
You say you cover your pan during the 1 1/2 hours of smoking, do you leave the foil loose so some smoke can get in? One of my major complaints with chicken is that often there's just no smoky flavor.
Also, without knowing how thickly you sauce, it sounds like your sauce could be pretty sticky/sweet. Maybe leave out the corn syrup? Chicken is always the messiest category, and while most judges will try the first bite with skin, sauce & all, we do tend to then try to get past the sauce into the chicken itself. IMO, the meat should be able to stand on it's own, and in 7 years of judging, I've never heard a judge say they wish there was more sauce on chicken.