How far have you had the curly maple bow drawn? How many times?
I tried a d/r bamboo backed curly maple bow once, and I should have kept it just to show folks. I guarantee you've never SEEN so many frets in one bow! Maybe it was a soft piece of maple I had... I don't know though, it felt pretty hard as I worked it. Oh well, all I'm gonna say is... good luck with that one. I'll be surprised if it holds up for you for very long.