I've been diagnosing this issue for the last few months now. Again the only way to get the newer builds is what I posted above.
But I just found another interesting bug. Got the latest build (14361.0 via the reset method) and the store app won't auto update the pre-installed default OS apps. Even after resetting the phone and trying to restore from a previous backup, or "start fresh". I have to go through all the apps installed, start them, and they say they need to be updated, which takes you to the Store app, then I have to wait for the screen to fully load (slow) and select Update.
I just reported it via the Feedback app (which had to be updated before I could do so).