In my opinion, the best way to "hold their feet to the fire" at the BCMR/BCNR is to file a lawsuit in Federal Court. For disability and military pay matters, I tend to think that the best court with jurisdiction on these matters is the US Court of Federal Claims. In fact, I often look at whether it makes sense to go to the BCMR/BCNR in the first place. It is possible to get a good outcome from these boards, but I think that in most cases, it makes more sense just to file directly in court. Exceptions apply, but that is my sense.