There is no secret formula, your best bet is to start remembering greens and aim for spots on your approach to give you the straightest putt possible, i.e. kiawah #7 (par 5), just right and long of hole will give you almost straight putt, almost uphill.
Remember uphill putts dont seem to break as much. And use the reverse view to see a much better detailing of the break close to the hole. I personally putt 99% of my putts in reverse view for that reason, and you seem to get a straighter view of the putt as well. Give your putts enough juice to get there and 12inches (at least) past the hole to at least give it a chance of reaching the hole, and of course for any putt that breaks, there is no 1 line, or 1 speed, there are many lines associated with many speeds.
Just try to remember how certain putts look, and for anything that breaks, you are not picturing it going in the front of the hole, butfrom the side of the hole. And just as important, improve your approach shots, good shot 12ft from hole, great shot inside 6ft, thats a much easier putt. Even the greats dont go lights out from 15plus ft, most of them dont see many putts outside 15ft for much of the round.