[joetapley]

I guess you've learned the hard way that taking selection charts/programs at face value can drop you right in it. Whereas asking other other archers turns up the immediate response that 1816 is too stiff. (nudge hint to Dave about how an equipment database would be invaluable).

Best you can do is up the poundage and reduce centreshot and spring pressure as much as you can get away with - short of buying new arrows. As far as tuning goes your probably better off using a walk back approach rather than bareshaft with mismatched arrows.