There is a structural problem with CBG battle schools which simply comes from the career profile of the average reservist.
There is a perpetual problem in finding enough Class A reservists to properly man these structures. Vacancies aren't enough, you need warm bodies senior enough to do the teaching and those are typically the ones who have jobs and don't have much time to give during the winter on Class A and certainly not in the summer on Class B.
Conversely, full-time positions, whether Class A or RegF, are generally underemployed in the winter and looking for leave in the summer.
I'll admit my info on this is purely anecdotal and on only a few sample that indicates its a universal problem.