FWHing by definition is the use of the flavoring or aroma hops, as the FWH addition. They recommend using approx. 30% of the total hop bill for this.
For THIS brew, youd generally use the 15 minute and 5 minute additions, for a total of .5oz as your FHW.
On most recipes you do not want to use your 60 minute hop addition for your FWH, because generally these are higher AA bittering hops and FWH is meant to be used with noble, aroma or flavoring hops only. Also, with the higher AA utilization, you my not have as pleasing of a hop profile if you use typical 60 minute bittering hops as FWH additions.
In general, keep your 60 minute addition the same.... move flavor and aroma hops to the FWH, a total of 30% of your hop bill approximately. It is GREAT in IPA and APA brews. I speak from experience.