I don't have any experience with CNBG, although I hope to change that some day. But I hear what you're saying George, and as a matter of comparison, I have stated for years that I have doubts about using a Wr chart intended for BG, on a HBG. The hybrids typically feature a very heavy, (thick) body dynamic, and I believe using a chart intended for BG skews the results to be more favorable than what they may actually be.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.