I really like hickory a lot! Does really good in the dry climes I live in. Hickory is really tough. Unless there are some major violations on the back and the tiller is decent a backing is rarely necessary.
That said, breaking your first bow is a lot like getting dumped for the first time, you’ll be wondering what else you could’ve done to save it. A light linen backing would be fine, no need to ad lots of weight. I find that thrift stores tend to have a fair selection of women’s 100% linen pants in sizes that can back a few bows for a buck or two.
Looking forward to the pics!