Steel shot patterns one choke tighter then lead shot.
So that rules out your Full choke.
I would try IC for jump shooting and Mod for the real long passing shots.
Also, 1 1/8 @ 1550 FPS or 1 1/4 @ 1400 FPS for jump/pass shooting? Most shots will be further out so I'm thinking Mod choke, but speed or payload for a duck flying away from you?