I'm having trouble with the skin on the wings getting tough when I'm smoking them. I like to hit 'em with some heavy smoke, and am finishing them in just over 90 minutes. I've tried a couple strategies to include mopping with a butter/rub marinade during the process (which helped), and brining them. Still a bit tougher than I'd like. I'd appreciate any advice as I'm trying to make chicken wings a cornerstone of my diet. Thank heavens their good for you, right?