Joe, never ever use the mulligan feature when practicing shots, each time you hit one mulligan, it counts as 2 hits of the life of the ball.
If you want to practice your irons, set up a practice round at Kiawah, #1, low wind......drive it, then hit your iron back to the tee, then to the fairway left of the green., then back towards the tee and back again. Just keep doing that til your shots are up.