I agree that usaush needs to be synched with the systems I maintain in California (usaca, usai, usaib, usaus, usausb, and a little of usasf and usaif). When usaush was drafted, Si synched it to those other systems as they then existed. However, I was in the middle of overhauling the other systems in California, which ultimately threw usaush out of synch. Your fixing the NMPs involving usaush would really help.
I've made some spot edits to usaush files in California, such as to make conforming changes where a usaca route is concurrent with part of a historic route (like CA 14U, which overlaps part of US 6 Historic).