Re: drills for over the topStand behind the ball and pick the line you want the clubhead traveling back along - presumably less inside in your case. Put a coin on that line about 6-12" behind the ball. Brush the coin on your take-away. Repeat ad nauseam!
Make sure you initiate the downswing with the lower body i.e. legs, hips. Do not start down first with hands, arms, shoulders; they'll follow naturally if you start with the lower body.
Put two balls on the floor either side of the one you're hitting. Put one of them further from your feet than the object ball and slightly nearer your back foot. Put the other one nearer your feet than the object ball and nearer your front foot. Make the gap between the outer two balls big enough to easily get a club through to hit the object ball. Hit the object ball without hitting either of the other balls. If you're throwing over the top you'll almost certainly hit the outer ball first.