I cook on a Gateway, with the Gateway basket(direct heat). I typically hang ribs but have been playing around with cooking them on the grate. If you're having issues with the bark not setting up, 1.Wait longer before wrapping 2.Make sure you're not spritzing them. 3. Go lighter on the rub
I'll check the bottoms every 30min or so, if the bottoms are not getting too dark I wont flip them over. Wait until the ribs are starting to sizzle, and the fat is starting to bubble and then wrap them. The ribs should have a nice color and it will kind of look like foam in some spots where the fat is bubbling. If you're not wrapping ribs, and still having issues setting up the rub, then yeah, try flipping so that the bones are up.