Yeah, I don't know man. I helped a player prep for the U.S. Senior Open there and I don't remember many putts that were 4%+. You'll get them occasionally, but you need to be 90° to a 4% slope to get a 4% read, after all. Or at an angle approaching 50, 70… 90 to a higher slope to get 4%.
Do you have a specific green you could talk about? I mean, we may as well, since the original question has been answered already.