re: What was the key to fixing your driver slice when you started golfing?

Your flat shoulder turn in transition is slinging the club out over the plane.

Get a club and a wall. Get in your setup with your arse about a foot from the wall and swing to the top. Slowly transition, and try to drag the clubhead down the wall for about a foot before it finally comes off the wall. This should help.

If you’ll watch some pros slow motion you’ll see that in transition the clubhead actually works down and behind the golfer and away from the target to start the downswing. That’s how they shallow the swing and attack the ball from the inside.

Compare where you and Rory differ. Same spot in downswing. Look at his clubhead and hands then look at yours.

Go to the 1:50 mark of this video
Chris Ryan YouTube