i remember a time that i had the same problem what i did was to take all the different arrows that i had and cut them to the same length these included 2219,2216,2117,2115,2114,2018,2016, 1916.even tryed carbens 4560 and i shoot 70# all but one arrow would go to the right and that arrow is not the one the chart even listed for that much poundage.what you have to do is try different things find out what works for you.rite now i shoot a mathews switchback 70# 26.5 .1916 with 4in vanes ,wasp camlock 100 and a laydown rest (dont know what one it is but it caust $109.its a good one) my old bow was a mathews fx ,it had a bowdotle rest ,arrows were 27in 1916 ,i did try carben 4560 but that right thing washappeningagine sofor hunting i just stay with the 1916s