there are other things you have to check and double check-
'native 60Hz monitors'

you got to check the edid by hand - double check all screens timings-

we are using switchresx to capture the current screen EDID timing-
multiple shows out there have had mixed up refresh rates - 59.997 and 59.95 on one show this week-
monitors that both show as '60Hz' but arent

need to calculate the exact screen timing from the total frame size

also in 50Hz land - we discovered a variety of timing away from different monitors that werent exact