Nicely finished bow, but the tiller is horrible indeed. Being 72" long, I would knock it down to a 65-67" ntn, retiller it, and refinish it.
another good option might be adding a backing. Maple/Ash would give an excelent backing for hickory
(as maple's lighter, it won't put as much strain on the belly as hickory itself. leading to less set and better performance, similar to trapping)
goodluck!
Nick