John, once the limb tips are bending down to about 9 inches, you should brace the bow up to about a 6 inch brace height and continue tillering it out. A shorter string applies more stress to the outer 1/3rd of the limbs. I quit using the really long tillering string years ago. Now I cut in the string grooves and put a string on the bow that lays flat up against the belly right from the start. But it does have a nice bend and a shorter string will bring those tips around more.