User blog comment:SlashZero/Summer 2015 E-3 Hard S Rank Pre-final & Farming Composition/@comment-25477086-20150819014457/@comment-861160-20150819022405

The cap applies after engagement form and formation. So, if you consider head-on engagement you want around 188. With no equipment Hiryuu is 55 + 1.5*64 = 151, so if you put say a skilled Type 99 and a Suisei (601st) that puts her right about there. If you want to bet on a 60% chance occurring, then you can stack more accuracy.

The AFP formula was something I got out of the very early testing reports with the new system (I think, second day of the event). As my predictions have never been wrong yet for one reason or another (as it's still kind of unclear on what the stats of the new Wos are even), I hadn't a reason to go look for a new formula yet. Thanks for telling me, I'll look into it some more.