BFL must have changed. The rep pattern is 12/10/8 and then superset 12 (I think). I don't have the original book anymore, but I'm absolutely positive about the 12/10/8 then something pattern. IMO, 15 reps is too high. You'll get a lot stronger and build more muscle if you stay in the 8-12 rep range.
The only time I do 15 reps of something is body weight exercises, plyometrics, or warmups. Or something stupid like doing my age in pushups
Does anyone still have their original BFL book?
Mel