I think I have found a way to figure out each of every 1ns putters. Go to the first hole on St. Andrews and do this in a practice round with the balls u r currently using. You will have 15 shots (mulligan’s) to figure this out. Or reset a new game. Set up the practice round for each green speed you are making your putter distances graph for. Drive. Then hit towards the right front of the green at say 4:00. You can activate each scale 10, 20, 30, 50,100, all of which your putter has by being father away from the pin. If you putt across the front of the green 4:00—7:00 you will have a flat zone. When you move the arrow to set your putt watch the color of the line of it. It will turn red if the green is sloping away from u. It will turn blue if it is heading uphill. You are searching for black, .though it wants to point & give u the green mostly in front of u towards the flag, it will go left or right away from u. Look at the black lines under your feet. The front part of the green is what you are aiming for. Be careful u don’t hit the balls in the canal. If you are on the 60 foot scale putt at 10 % write it down. Take a mulligan back to the same spot. Hit 20% if it is double the 10% you can just add the percentages.hit a 30% to make sure the increments are equally multiplying. To get to the larger scales putt further away from the pin still on the front. You should be able to get all but the 300 foot as the green is not long enough. Just by hitting 10,20,30,40, % etc. and then make your own graph for your putter on level ground. Change the game to different green speeds and do it all over again for each speed. Then use the uphill & downhill stuff these other nice folks have helped with and you should have your own much targeted scale.
It is working fine for me. I am not the best at reading break, but the distances are spot on. Hope this is understandable & helpful.