Ditto what broketooth said!!! You probly have a lot of set I'm guessing?
As per your question on unbacked hickory board bows . . . that's one of my faves!! I've made three so far, similar to the design you've done, from 35# to 50+#. All worked super and no worries on breakage, even with less than ideal grain, pin knots, mystery streaks, . . . Hickory is TUFF stuff