So I am helping an older gentleman (80 yrs young) setup some arrows for his upcoming Africa hunt in July. He wanted to set up some new arrows around 650 grains instead of the 400g arroes he has now.. Everything was going great until we backed up to 50 yds, at this point the arrows started flying horribly after they flew say 35 yds. AT 20 and 30yds they looked great then boom . He is pulling 52 pounds from a pse carbon bow 27" draw, I had some .300 vap tko shafts cut down to 27.25" then put a 100g iron will hit insert and the 25 grain collar and a 250g head. I need to check a chart maybe we are way to stiff or weak but wanted to see what you guys thought. Could be a tune issue?