Here's what I do, with a ball of my choice, in practice mode, I go to the 15th green @ bethpage and putt from different position on the green. Because my putts are lousy from 5 feet out, I practice 4 diffferent shots aprox. 10 ft in front, behind,from the left and right of the pin. I chart my GS, PM, D,Eup or down, and my break. I feel confident some of the Champions or TL will tell you the is nothing like practice on the Greens you play on. you get to know the breaks, you learn to ajust your speeds. My practice rounds for 9 holes run in the high 50's and low 60's. I'm still a work in progress, but untill they add different putting greens. Here's an idea.
PS: I didn't realize you were a legend until after the 1st post, I need to be asking you for pointers:)