Killtron200,
I wouldn't worry about the checkrides you've already busted, just focus on the next one. Definitely don't try and pull the "Examiner was wrong" stunt. While not every examiner is great or fair, the majority of them are and they hold much more credibility on a professional level then you would sitting in an interview.
Be honest, explain why you failed, what you learned from it and how its made you a better pilot. Checkride failures don't go on your resume, so chances are it will only come up during the interview. Talk the talk my friend, and just be honest.
People make mistakes. Checkrides are stressful and whether the examiner purposely tries to stress you or not, the stress is there. You need to learn how to deal with it and force yourself not to make mistakes on the next ride.
One thing that helped me on every checkride, was keeping things slow when it permitted. Think before you say or do. Your instructor wouldn't be sending you for a ride you weren't prepared for, so believe in yourself and the fact that you can do it and you have the knowledge. Checkrides are an 80% mental game and you need to get in the game before the ride begins. Check the nerves at the door and put on the Captain hat. Its your beast to tame, so grab the reins and get it done.
I've been on great checkrides and not so great checkrides. I've had great examiners and I've had very tough examiners. I had an examiner yelling in my ear on my Private ride, an examiner telling me the statistics on why I probably won't pass his CFI ride and a Chief pilot screaming "We're gonna die" in my ear during a checkout. I passed all of those checks because I was in the game mentality. I filtered out the non sense, grabbed the controls and did what I was trained to do, and what I knew I could do. There's no reason why you can't do the same.
I used to prep my students before sending them for checkrides. I would focus on getting them mentally ready to tame the beast. When the big picture is clear, you can see your ticket before the ride even starts. Don't look back, just prepare better for the next ones.