I still think 540/23 is a bit too much; I was using 450/15 in the league races yesterday and it felt wonderful. Overall, I think most people are using way too tight a ratio, which, if they have a bad FFB profile as well, is really hurting them in terms of tyre wear.
Watching that Huisman onboard footage from Macau, it looked like the equivalent setting would be about 740/22 or so, give or take 1 degree, but that may have been a steering rack fitted especially for that event.