Ii have the same problem and it is cAused by a out in swing path. You may think you are swinging in to out but if you unknowingly rotate your shoulders flip you hand our over swing at impact the club head will quickly move out to in. To correct this you almost have to feel that you are swinging diagonal fron in to out with quiet hands and thrust your hips out to avoid spinning your shoulders. Before i swing i have to groove this a few times and then i swing and the ball goes dead straight or draws. Its frustrating as i have had balls go 200 yards and then curve slightly right. What you are feeling with an in to out swing is not what you are doing. It has to be extreme.