Mortensen would base his exposure off a metered bright highlight reading on the forehead of the model(possibly a Zonie 71/2-8) and modify this with experience(he didn't entirely trust lightmeters).He would develope to "gamma infinity"(just till develope fog started to set in). Agitation pattern is by rumor and antidote,as Bill never mentions it in any of his books. His development timing was based on the film/developer combination being used(films of which we cannot get on todays market,unless someone starts repackaging Super-XX in 35mm again)
As for bracketing, his only mention it in "Outdoor Portraiture".Where he says to do a safety of 1 stop more and 1 stop less than metered reading.