Nice bow!
I've always heard that lemonwood was susceptible to fretting. I've only made one bow with lemonwood, a hickory backed lemonwood ALB and had no trouble with it. I actually like the way it works.
If I were laying up a tri-lam with this wood combo I'd use the compression strong ipe for the belly, hickory backing and lemonwood core but aesthetically the way you laid it up is more pleasing.