The first thing I would do would be to get somebody to check my alignment before trying to change the grip or anything drastic like that. While you're doing that make sure the ball hasn't slipped towards the centre of your stance too and that you are the correct distance from the ball.

You could be swinging abit round the shoulders too much too so your shot hasn't had time to straighten out before it meets the ball. This is probably also linked to the distance you stand from the ball.

You also mentioned your left hand. 3.5 knuckles seems a bit strong and I think you'll probably hook your shots. I would be looking more at your right hand, maybe it's a little too strong( turned too far to the right.) I always have the crease between the thumb and the trigger finger running up the centre of the shaft when you raise your hands to your face to view the grip. I can assure you it doesn't look like that when you address the ball. Let us know what you do and tell us your results.