Ill tell ya folks, even after 30 yrs. of this trad. game, sometimes your gut feeling is far better than any chart or calculator could ever be.
Ive been fine tuning a Hill Tembo ive acquired, and after following the guidelines of several spine charts, I kept hitting left, no matter what weight point I used. So without any real satisfaction, I finally went with my gut feeling and tried a shaft that is spined 10 lb less than what would normally work according to the charts, and WAALALA! perfect flight and pointability!
Just a little food for thought on arrow spine, if the charts aint working for you, dont be afraid to think outside the box, the results may surprise you.