I'm sorry I don't use Hullform so I can't be of much help on this one.
From what I've heard, Peter is quite helpful though. Have you tried e-mailing him for this information? http://www.hullform.com/ support@hullform.com
Or, I know Peter as well as several users of Hullform including Ron White who completed a very nice project with the program can be found in rec.boats.building
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