Proper Arrows Tryng to understand the Spine charts. This chart here shows me @ 3 to 4 if I understand it. I am shooting Arrows 28 inches from knock to tip of broad head. Tips: 100 Grains. Draw weight 60 lbs Expedition Hunter (Black) 7595 - Shafts Spine .300" Now looking here I seem to be in the ball park. Am I understanding this chart correctly ?