I had this problem when I took lessons a couple of years ago. Driver was always going straight right. Not a slice. Basically I was coming out of my posture and opening the club face. The instructor showed me videos and sure enough on my shots to the right I was coming up on the downswing. The shots where I held my posture I was consistently hitting nice tight draws. Then he had me setup for a fade. On the shots I kept my posture I hit these nice tight fades that landed basically where the draws did when I kept my posture landed. Basically he was showing me if I held my posture I was squaring the club face and I got much more consistent off the tee.