RE: brace height, riser or ATA
When I refer to form, I always talk about 'hunting' form. I don't do any tournament archery and hunt on the coldest of days. Clothing is layered to an extent that most would find uncomfortable and impossible with whichto get good movement.
Still, good hunting form must still be practiced and the need for higher brace height is more a result of incorrect draw length or bad form. This is a general statement and there are, of course, exceptions.
A few years ago,on a 15 degree morning, with a maximum amount of clothing, and with a veryawkward shooting position (try leaning out a treestand, shooting a left-handed bow right-handed, with a 40 yard shot), I only use a 6 1/2" brace height bow. I can recount many such situations, but that one was rather unique. Davidmil, a friend and I were hunting on the last day and my friend said that he needed venison. I obliged.