For the record,the charts have been known to be off.I use Archers Advantage to get my spine and have had the tuning process simplified beyond belief, when you know the arrow is perfect.
for the record I have both AA and TAP on my computer but I dont totally go by the data on either program because they arent always right either.
U use a good old fashoned method of trial and error which usually works best for me so that I may gather my own data.