Let me start with I truly admire the advice Mike and Mark give. I'm a long time fan and have embraced the Trilogy to great benefit. I recently purchased the Interview Series and listed twice to each cast, and followed the guidance. Very valuable.
However - when it came to my big interview, an opportunity that comes along about every 5 years in my field, I blew it. I blame myself, but I think part of it was I may very well have been over prepared!
Here's why. My interviewer was overly conversational. She didn't grill me the way I was expecting - the way I prepared to be. I found myself struggling in the interview, trying in vain to get my accomplishments across. I realize now I was "waiting" for the questions, and holding back, never really relaxing and engaging in an overly enthusiastic exchange of ideas with my interviewer. I was almost too committed to the preparation I had spent days on.
I was told by my recruiter they selected a final list of candidates who demonstrated "innovation" in their interviews. Thinking back, I simply felt I was too puckered up, following the formula too closely and not reading the signals to open up and enthuse my interviewer on the merits of my creative thinking.
My suggestion is this - if you find yourself in an overly conversational interview, simply say something like "I would change the system to totally blow the competition away" and shut up. Your interviewer will be compelled to ask "How would you do that?", to which you can then follow the guidance and go for BLUF, followed by the examples of ways you behaved in the past.
You'll stay conversational, but also convey your abilities, traits, etc.