On your next bow consider keeping at least the last six inches of each limb stiff. Longbows perform better with stiff tips, and the rest of the limbs doing the work. Make yourself a tillering gizmo, and start tillering with a shorter string. Make sure the string you use for tillering has little to no stretch, or it won't work well for tillering. I ordered my tillering string from 3 rivers, or you can make one from b50 or fast flight, whatever bowstring material you may have.