Well I refigured the obvious today. As the season approaches and my "tuning" continues, I found that I could not get a 28" bop, 52# shaft w/125g point to fly out of my bow. A 68" 50# Hill style. They would: porpoise, fishtail, twang, and do all the other than fly right.
Brace went from 5.75-6.75," nock point went from 1/8- over 1/2" and everywhere between. The only thing that helped was a 190g head. It took most of the crap flight away, and shot over a foot higher at 40yds! but still did not have that perfect arrow flight. Played w/ grip from heel down, to high wrist!! various amounts of heel pressure but no difference! Then I thought well shorten your draw a bit, 27" flew a little better but still had disgusting arrow flight. Then I went and shot with a slightly more open stance, made sure I was not straightening out my bow arm, not drawing past my lips, just what felt natural and with NO exaggeration. 26" draw, ouch, I'm 5'10" with a similar arm-span. But near perfect arrow flight, flew tail stiff, but no porpoising! now we are getting somewhere. Now drawing these 52# shafts cut to 26.5" w/ a 125g point puts me #10 over spine, so... I full length tapered them! first cut was 8" from nock, then from 1/2 way point, finally from 3" behind point. These full taper shafts and a 125g head weighed 465g flew a bit stiff, but no porpoising or tail wagging!! And with good trajectory. Never had much luck getting good arrow flight with any of my setups past and present when drawn past 26.5" regardless of FOC or spine.
Shooting from a hunting posture got me good results, getting shafts 5-10# under bow weight for my 26" draw and FF string w/ 125s is working good, slow, but way quieter, less shock, and most importantly, straight shooting accuracy.