Brilliant bow! - and the workmanship is very good! It's a pleasure to see such good photos too.
I've found that these bows seem to perform better with closer to 30/70 ratio for the tip/bending limb, as long as the inner limbs get an elliptical tiller. A little more bending limb will reduce stress and also reduce the tip weight that may contain a little "dead" weight. The 50/50-ones are incredibly smooth though, if the wood can take it, as it seems that this osage could. Beautiful!