I have right to left putting issues . The right to left that starts straight then hits a slope and then turns right causes me no problems it is the putt that is already on a slope that causes me issues . I think it is because the ball is above the feet and this has an effect on the posture and set up. If you grip the putter in your normal position you would have to do one of the following things or a combo of them to fit round the slope .
1) Bend your arms more to reduce the relative distance from shoulders to the ball
2) Stand further from the ball.
If you grip down the putter the balance of the club is altered . So that does not feel totally satisfactory. also on a severe right to left putt there is a tendency for the toe to get in contact with the ground which fosters the idea of standing further from the ball which leads to a more rounded stroke.
I have read that some people place the ball further back in the stance so that you get an inside out stroke to counteract the slope and hitting the ball more out of the toe end of the putter . Both of things are moving you from swinging the putter on plane and hitting out of the sweat spot. Also I think there may be an optical effect that effects perception as the ball is closer to the eyes. Logically a shorter putter would reduce the problems and those with longer putters must be at a disadvantage on right to left putts. Left to right putts are causing me no problems.
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