Disclaimer-I've never used this wood before. That being said, I wouldn't recommend trying to get that knot on the edge of the limb working. If you had followed the grain around it then yes. But since you've cut through it, the only option I see to making it bend there is to follow the grain around the inside of the knot and remove it from the equation. This of course, will leave a notch in the side of the limb, but if you follow the grain accurately it won't hurt a thing. Just be mindful of it while tillering and it shouldn't be a problem. Josh