Thanks guys its nice to have a network with educated peers.
This world wide web information age "virtual community" experience, of which this is only one flavor, is, from the dreams of the science fiction reading boy that I used to be, a dream come true!
Is there a superior that all local AHJ's answer to ?
The answer to your question is rooted entirely in the legal structures where you hold your license(s).
Where I am, the State of Minnesota got an AHJ established, at least in law, statewide way back in
1899 and included rules that permitted areas within the state to create their own inspection communities and that permitted local ordinance that could modify the requirements of the NEC. However, I am licensed only by the State, and my insurance and bond are only to the State. In my opinion, the State level AHJ is a strong anchoring influence that helps to unify the calls in the field made by individual inspectors, but there are still interesting differences that individuals bring to the mix. One person will see what another will not, and, conversely, one person will imagine what another will not.
I think this works to engender the continuing conversation that results in the NEC being a living document that is constantly growing.
'Course, that doesn't help you with the business issue of not doing the work for free. It occurs to me that the answer to your question might have part of its answer in the appeals process that you have at your option if you contest an inspector's call. You first take the appeal to the inspector's "boss", which is the local AHJ. Is it possible to appeal that AHJ call by taking it to a higher level? The answers are in the ordinances of your jurisdiction(s).