Need some advice on smoking ribs. Grill is a rec tec 680. I've tried various methods but still haven't got my ribs where I want them. Smoke flavor and tenderness is there but the top layer of the ribs are tuff. Like a thin layer of leather. Once you bite through that their fine. I'm guessing they are drying out. Do I need to start spritzing? If so how often? Thanks, Joe.