Mike,there are lots of AAFTA rules that are interpreted in different ways by shooters and match directors, and even board members .... mostly of desire to do something else, but also sometimes due to rules wording being less than clear. Much of this was originally built in to allow more latitude for individual clubs. The match directors have a LOT of latitude to interpret rules according to the AAFTA set.
Its for this reason I suggest shooting some matches to find out by experience how loca clubs do it now (rules seem to change yearly), and also, by face to face with those more well traveled on whats done elsewhere.
This game is a bit like golf in that ranges vary, but also that “customs” are as important as a written rules set.
It pretty obvious that most replies to your original post did not answer your exact question, I assume due to wanting to interject some other gripe about the rules, or because they didnt understand your post well enough. Your reference to LOW bipod from Prone position in HUNTER class seemed to be answered by referring to experience in other classes, of by guessing, with only two guys I could see really had salient personal experience shooting that way in a sanctioned match recently.