Actually, I don't think warm water helps enough to be worth the extra hassle.
Every gram of ordinary water at say 5 degrees that gets frozen warms the wing by 85 calories (5 degs down to zero, then the 80 calories latent heat of freezing).
Using warm water at say 55 degrees raises that to 135 calories, which is 60% better. Or you could just use 60% more of the cold water!