Hickory backing will break your heart more times than not.
I've never had a hickory backed bow last. Even in what looks like a prime backing, something always seems to go wrong. Sometimes it lifts a splinter when making the bow, sometimes it lets go after thousands of shots. I don't trust it anymore, especially when making high stressed bows. Overbuilt bows are another story, but they tend to be dogs anyhow.
I wouldn't use hickory again without a cloth backing on top of it.
JMO