The 1916's should work fine. I would bare shaft one starting out longer than you think you will need say 29 with the 125 gr. Set your brace height to where you like it best. Cut off in 1/4" increments. knock left point right is weak. Knock right point left is to strong.(stop before you get there) Knock high raise your knock point, knock low lower your knock point. When the arrow flies like a dart, you will then know your proper length. Sure beats guessing and ending up with to short of arrows.