I'd stay out of those joints personally.
All kidding aside. You're doing it exactly the way I've been building for a long time. I use Titebond most of the time on joints like these. I coat the stick, place it into the joint to put some glue on the other wood, recoat the stick and insert in place. Wipe off excess and let dry. I don't like CA in these cases cause it appears to just "sit" on the outside of harder spruce or pine. Titebond works well on all hardnesses of balsa. Thanks for listening. Mike