There is room for interpretation in BSF creation and use. For example how can a # possibly be created for the Belmont stakes which is at a distance run once/yr?
I use proprietary figures too.
http://www.pacefigures.com/ . I trust these ( speed and pace ) figs more than Beyers. I like it when BSF are off compared to CJ's (CJ is not me): I've made significant scores when that way.