-You can't isolate BYU Provo's student demographics from Hawaii, Idaho, and LDSBC.

Why not? If you supposition is that BYU-Idaho is picking up the slack that BYU-Provo isn't you'd be wrong. BYU-Idaho has a whiter campus than Provo. BYU-Hawaii will always be just what it has been. Don't know what point you're trying to make here.

-The US ethnic makeup is the more applicable benchmark. The church is not trying to recruit the worldwide membership to attend the BYUs.

I did point out that 85% of the US LDS ethnic makeup is white. BYU's ethnic representation is lower that this. If you compare this to the US ethnic makeup in general, the US is roughly 63% "white" (and it's complicated when saying who's white and who's not), BYU's numbers look worse. Is this what you were going for?

-Can you show acceptance rates and financial aid by ethnicity?

No, I don't have those numbers, but I'm a little bit concerned about the point you are making. And I think it's fairly irrelevant anyway. First of all, remember, that even though the Church subsidizes ALL member BYU students, BYU is far from being the largest supplier of financial aid to low income students.