Ron,
RaceQs uses the B factor of 550 so, 650/(PHRF +550) . The factor of 550 is recommended by US sailing association for all average conditions and used by vast majority of the regattas. http://www.ussailing.org/racing/offshore-big-boats/phrf/time-on-time-scoring/
We will consider adding the setting for changing PHRF factors in our later release.
