A side note when valuing GIRs. For me I see GIRS as
Good GIRS and as Bad GIRs. For me a GIR that has
me in a position that there is a significant percentage
That i will 3 putt, then that is a BAD GIR.
A Bad GIRS may be related to the length of the first
putt; the difficulty of first being able to come to a
rest within tap in distance (think above the hole,
fast greens, unlikely ball can finish within a foot or
so, etc.).
I view Bad GIRs similar to missing the green in the
wrong spot. Missing a GIR in a position where
there is a high likelihood of chipping in or basically
guaranteed of the up-n-down is my equivalent of
how define a Good GIR, at worst I expect a two
putt.
I track 3 putts and GIRs, because IMO GIRS alone
don't give a complete picture. I also annotate
my up-n-downs to better understand my approach
game and what is truly an up-n-down.
I do most post round on scorecard, takes about
5 to 10 minutes.