When it come to tip overlays, I go by the books. None of my bows, that I have built have ever suffered from limb damage. The bows I have repaired, due to string damage, have all followed along the lines of what I have read and studied. Personally, I have never pushed it. It is much easier to make a bone, phenolic,etc tip, than to risk other materials for the simple purpose of testing the limits. So I assume that is why I have never had any tip failure. I have yet to have a bow returned or brought back due to damage, and knock on wood, i wont. But I do insist that if a person is going to use a ff string, that I will use materials suggested for said string. Actually, most every bow i have ever sold has had tips made for any string. Like I said, it is much easier to just make a tip that can handle it. No need in pushing it.