Hi Frank,
Sebastião Salgado likes to use the combination of Tri-X 320 and A49 for medium format. His film development guru is Philippe Bachelier. You could send him an email; he should be able to help you.
You can find his website at
http://philippebachelier.com/. There’s an email address listed there too.
Do let us know how it goes.
Good luck and best regards,
Taher