Dear Axel,
Her are my responses:
1. PATH. Not especially. I do believe the putterhead ought to be moving square at impact and hopefully for about 0.3 metres on either side of the ball (1 foot). technically, however, it is perfectly possible to send a ball off straight on line by a combination of stroke path coming across the startline and a putterface twisted out of square. A 30-degree cut stroke path plus a 5 degree open twist of the face goes pretty straight. (Face twist has more effect than path.)
2. READING. Sure! Use good posture, use your feet for balance and feel, find the highest and lowest parts of the green, see a line that is straight uphill thru the cup, read my tips on green reading, and always look at the surface with a rolling ball's speed in mind.
3. UP-TICK AT IMPACT FOR LINE. It's practically impossible to hit a golf ball sitting on the grass of a green and start it rolling immediately without spin. I'm not convinced that a little spin is all that hurtful to line or distance. Bounding or bouncing by hitting the ball into the spongy turf or launching it too much does hurt. But to me hitting a little up on the ball has more to do with using the solid part of the putter with a square blow that sends the ball straight, not about "true roll" or eliminating skid. It really works best to reduce side spin of face twist. I'm not perfectly clear why that works that way, but it's something I've paid a lot of attention to. The ball goes a lot straighter more often using a slight uptick thru impact. It also makes the shoulder rise vertically instead of curling around the hip, so that is probably why the ball goes straighter that way.
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Cheers!
Geoff Mangum
Putting Theorist and Instructor
The PuttingZone.com
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