What kind of advice? Tillering is what makes a bow a good bow, bad bow, or a broke bow. You have to keep your chi up and use your zin powers and become one with the bow

You are far on your way and have done an excellent job on that osage bow. Im a little jealous. My first self bow was a peice of garbage. It became fire wood not long after it started to take shape. I learned then one of the most important lessons; Dont try to make wood do what it doesnt want to do. Also, the most important bit of advice I can give, and I mean IMPORTANT is; take your time and when you get a little tired or frustrated, put it down. It will be there tomorrow. That was a tough one for me. But when I started putting them down and coming back the next day, everything started to fall in place perfectly.