Also, Japanese women have the same average height difference from American women as the men do ... 2".

I think the problem is the WGR weightings, and that the Japan and Asian tours are probably stronger than the weightings suggest.

PGA and European tour events give a minimum of 24 points to first place, with 56 for the BMW, 80 for the Players, and 100 for the majors. Asian Tour events give a minimum of 14 points, the same as the Nationwide tour, and the Japan Tour gives a minimum of 16 points to first. In addition, PGA events always give points down to at least 27th place. The Asian Tour only to 17th place, and Japan Tour only to 19th place. This makes it very difficult for an Asian Tour or Japan Tour player to get a high ranking. For the Asian Tour player, just as difficult as for a Nationwide Tour player, and for the Japan Tour player, only slightly less difficult.