I finally got my level 1 certification for high power rocketry! It took me two tries: on the first launch, the rocket motor cato'd or something strange like that. So I was able to try again on the same motor and everything, and everything worked correctly on the second launch. The dual deployment worked flawlessly. The only woe is the tree-recovery. But I'm so grateful to Mike Koppelman for lending me his transmitter, or we never would have found it in the first place!