It looks like Yatagan broke into the 80's! It now holds the nano throne by a margin of over 1.6% APS. And, it has less than 2% PWIN between it and Fuatisha.
Just for fun, let's try a version with
integer initialized to 64, and with division-based reduction instead of decrementation. I'm pretty sure it would hurt APS, but hey, it's worth a shot.