I know that it works, it's 2B because it's slightly easier. If you time the 5B wrong j.C comes out on the ground.
They all have 95% repeat proration, not 5%. The combo isn't affected because either way you have 1 repeat proration.
I did the math, and I had SKD double checking my stuff. If you do the math yourself and come up with something different by all means let me know.