I dont hunt a tree stand but if I did, I would wear a harness.
I would also make sure to test the harness out.
You said...
"I did have a full body safety harness on but I don't really want to try one out on a fall."
Im not sure what you meant, but Im going to suggest you try your harness out on a fall (on purpose). Maybe only 5-10 feet up.
High enough so you wont hit your legs on the ground when you fall but not so high that if it breaks youll hurt yourself.
After that Id practice getting down while hanging.