Looking great, Ben. Welcome!
You can finish bows with all kinds of things. I usually use 2 part epoxy or polyurethane on laminated or more modern-looking bows and oil/beeswax on real primitive-looking stuff. Long as it won't chip or flake when bent a little.
10" is longer than I would have done the handle on such a short bow, but it worked out, right? That, plus a stubborn transition getting the limbs to bend down from the fade/dip area makes the bow look pretty flat through that middle section. BUT, again it worked out, didn't it? And the bow did not seem to take excessive set, either, which a lot of people say oak will. So, yeah, you did fine!