Just my 2 cents worth.
Think we ALL over-analyze these putts. But, I'm STILL trying to get a handle on putting on "Championship Speed Greens".
I calculate.....2.9 ft. for every 10 ft. of distance...on "Championship Speed" greens. Gets me close. But, I don't have the BEST clubs or balls.....and, I do think that makes "some" difference.
On down hill putts on "Championship Speed Greens".....I normally DOUBLE the calculation....so, instead of hitting a putt 40 ft., I'll hit it 20 feet on my meter.....usually works on most holes. Dropped a 53 Ft. downhill Eagle putt yesterday....so, I know that calc. works pretty well.
Still.......I have learned a long time ago....the PUTTING GRID lies. Well, it does. So, you really MUST learn every GREEN.....to know where those little humps and valleys are...that the Putting Grid just doesn't reveal.
Also......I rarely move the "putting target".....have always putted "by feel". Though, I do calculate for the various "green speeds".
I'm still AMAZED to see other Champion Players scoring 15 to 20 strokes UNDER PAR on any course. I personally have NEVER enjoyed having to "calculate" putts....but, you pretty much have to.