The thing is that if Mary Rose bows werent ever found, the bowyers would be still making oversized victorian target bows and wonder where is the performance.
One of possibilities is this,you might round the edge of back even slightly more.
http://sweb.cz/hawkwind/elbprofile.JPGI m making lots of longbows and the rule is - start with squared stave, then you work back down where you want it, make width taper based on the experience and then round back edges as necessary. Then use facet method for shaping the belly and tiler only the thickness to get good bent shape.
One of MR profile variations has little flats on sides of bow profile, which appears exactly when you do this - start with squared stave, round back edges and then belly and the profile emerges as on one of original bows.
Jaro