I played another round today with the claw grip method and I was impressed.
I'm going to stick with it. I find it easy to do and I can get the ball rolling on the line I want. On putts 12 feet and under, I holed 5 out of 10 which is okay.

One of the worst things is people asking me why I'm gripping the putter like that. Yesterday in a Better Ball Comp my playing partner asked me whether I'd practised with it. He seemed worried I was going to let him down. I came "in" on 13 holes so I don't think I did that !