|Scott, welcome to the fleet. It's good to hear that Minx has a new owner. Where will you be sailing out of? Are you planning to race?
In answer to your question about the HBL for the Mark V, I think you will find that the reason the class rules appear to have a limit that is less than PHRF is that because there is so little room on the Mark V to fit a main with maxie roach the class decided that they didn't want to get into mains that were impossible to tack and the class therefore also outlawed back stay whips or flickers.
Still Knot Working Mk V #75