You can do any of these to stop OTT:
1. put a cardboard box or head cover a few inches outside the ball pointing almost to right field. Swing easy at first and see if you can follow that line with your downswing to impact without hitting the obstacle.
2. Strengthen(not grip pressure) your left and right hand grip, especially the right hand more to the right so knuckles are almost pointing to the ground-when you start hitting hooks, you can weaken it a bit until you get the shot shape you want.
3. Stick an old shaft in the ground outside the ball and leaning in over the ball, try to swing easy and swing under the shaft without hitting it.
4. Buy or make an inside approach training aid. I made one with bendable plant stakes and some foam rubber. Go on line and see what it looks like then duplicate the angle