n0g0

It seems to me that the big takeaway is "get it as close as possible". And if circumstances won't allow for pin-hunting, and you know you'll be some distance from the hole greater than 8 feet, then (and only then) better to be below the hole. This video on Aimpoint probable reads makes a lot of sense to me as to why we'd want to avoid the 90* putt, if possible:

Take a look at Dave Pelz's book on putting. He did the measurements rolling a putt with a tool, and found that on a constant slope, uphill putts break less than downhill putts. Not to mention that if a "perfect putt" travels at a speed leaving a miss 18" past the hole, judging an uphill speed that will lose speed with distance is easier than judging a downhill putt that gains speed (gravity). So the article is correct. And that means your heat-map is close, but the green zone should be triangular, and so should the above and below zones. A combination of yours and the article would be the best map, since proximity inside 3 feet is so critical. Outside that, leaving the ball with an uphill putt is the absolute best course management plan. Now good luck hitting the wedge shot that puts you there!