I've seen some dogs that go nuts.....and they're a JOY to hunt over. My Ashley was a laid back hunter/retriever. It cost her in some trials (subjectivity).....but her nose was unmatched by any I've seen.
Later in life I let her run banks.....and that was just fine. She was solid.
If I had duck hunting opportunities where I live now (in abundance)......I'd never have found deer hunting. These dog guys are spot-on...... If you've ever had those moments with your dog.....the one you trained......you know "that feeling".