I am not familiar with federal rules, but all I can comment on is your last sentence. In which you say you have exhausted your administrative remedies twice already. Which pretty much speaks for itself, and res judicata/estoppel, "the thing/issues are/have already been decided." If you appealed the ruling and it was overturned or remanded back, res judicata/estoppel would not be a valid defense.
I wish I could offer something more encouraging, but it appears your case has been decided already. Have you researched res judicata/estoppel ?