Oh really...I'm not sure if that's a good thing for him to switch the week of a major. If I were him I'd be more focused on making putts inside 3 feet, which is truly his Achilles heel.
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I believe I read that he said the M2's gave him a different ball flight/shot shape that he felt suited Augusta specifically better.
As for his putting...who knows. He hasn't really putted that well in a few years.