Yes extra an long tillering string lies. The very first time I put a string on a bow to tiller it, I already have my string grooves cut into the bow tips, and I string the bow and the string lays real tight up against the belly of the bow. I work the bow on the tree till the tips are bending to say about 6 inches and if the limbs are bending nice and even with a sweet arc, I shorten the string to get the bow to about a 3 inch brace height. Then I keep tillering the bow till the tips are bending to about 8 or 9 inches. If the limbs still have a nice even arc I will shorten the string and get the bow to a 6 inch brace height. After that I finish tillering out the bow. Like has been said above, the shorter string you put on the bow, the more it stresses the outer 1/3 of the limbs.