Fast greens are stated speed more or less.
VFast are +/- elevation to achieve a net distance, then divide by 1.1 downhill, no math uphill.
Tourney are net distance, then divide by 1.42 downhill, divide by 1.35 uphill. (I've used 1.50ish downhill on Oakmont/Oly, and 1.20 uphill on same courses. Kiawah and St. George are noteably a tad slower than the others, too.)
Champ greens take that final number for tourney speeds and take off another 10%ish.
Tweak by a few hundreths on any given day. And, long putts over 40ft are faster than than you think.