I can only endorse Dawg's advice after first hand experience of improved consistency in my lag putting using his suggested method.

For the past month I have been using the suggested method to try to improve my distance/speed control in order to improve my lag putting, which in turn should lead to reduced 3 putts.

I can say I have been more than happy with my putting, as I have only 3 putted 3 times in my last 4 rounds.

Try it. I wish you the same success that I have experienced.

Cheers