Hi!
As I said 11 years ago I use Ca glue for most of my building.I never use 30min epoxy! Glue epoxy is messy and heavy and is very hard to sand.
The bonding strenght of All glues is so good that it's not the glue it self that breaks. What's important is how the wooden parts fit! In your case gluing the fin to a sport airplane ordinary thin or medium Ca could be used and of course accellerator, thats a must!