RE: Frustration
Good advice on the letting go.... the following is what worked for me...
To get him to go get the duck. Its back to yard or at least field work. Stand with him at heel. with your shotgun. shoot and throw bumper or better yet have someone else stand behind you and throw it. repeat and repeat and repeat until he associates the gunshot with him having a retrieve you will know when he starts the association cause he will want to jump the shot.
Kind of like when you are introducing the gun to the dog.
Eventually he will be breaking on the shot. that will remedy the (not wanting to get the bird) but now you will have a breaking problem. and that is easily corrected with correctly timed shock collar correction and the sit / heal command.