What did you want for final weight? I think pulling it to 57#@19" on the long string is WAY over doing it. You're asking way too much, way too soon. Your limbs weren't likely bending much over their entire length yet. I'm guessing you hadn't reduced your thickness taper much and it blew right where it was doing all the bending... right at, or near, the fades. I think your glue up would likely have survived, had you been more patient. But, it sounds like you've learned a bit, and I know I learn more breaking bows than making ones that turn out. Back in the saddle, asap!