Edit: I'm not a lawyer. I'm not in the legal profession. You obviously had counsel and they did their job. In the final determination - Legal Analysis point one;

"Here, the Request seeks a report of “all titles checked out by those patrons that are not students.”[...]"

The issue isn't they didn't give you what you want, the issue is you didn't ask for the information you wanted.

Your counsel should and could help you rewrite the RTK request, you want policy's that dictate internal review procedure for determination of books purported ability to be removed, and what criteria is determined to make a book become under review. Any communication regarding books that should be or shouldn't be banned directly or indirectly to the board and all their staff.

That's the stuff you want. They can't do anything without having procedure, and procedures need to be followed.