On keeping a steady head, dont force yourself to take a tour style turn, if you feel yourself moving away from the target in the backswing, either let your hips rotate open a bit more, or stop rotating, that's your bodies natural ability. Also watch out if your shoulder turn is to shallow. If you take the club to far inside, then your probably taking a very shallow shoulder turn, this movement limits the amount of turn you can do before your forced to weight shift to the right to finish a full turn. Get your shoulder turn a bit steeper, like your left shoulder is pointing more towards the ground.
I find a flat left wrist will work its self out if you work on a steady head and weight shift. Just because your hands adjust to what your body does. Its called hand eye coordination. People who flip are those who usually dont keep there weight forward, or do a reverse pivot in the downswing. Its there eye to brain saying, 'Hey i wont hit the ball if i don't flip at it'
If you get your weight forward, you hands should work to getting further forward before you clubhead gets to the ball. I found when i got my weight forward and head steady my divots naturally went forward, an i can hit golf balls off my front foot with wedges, if i really try. So you'd be shocked how much those two help out.