I had the opportunity to go to a clinic with a few world-class Kenyans (OG/WC medalists) and their attitude was so extremely different than any Western runner's. Did they have any mental tricks or strategies they used when racing? No. Did they have a lucky pair of shoes, necklace, etc.? No. Count calories? No. Get overcome by nerves? No. They were so baffled by any question about this kind of stuff - they just get it. They don't obsess about the stuff they can't control. They just believe in their training, believe in their strength, and will put everything on the line to win. If they win, great. If they don't, they tip their hat to the better-prepared or more-fit man on that day, and move on.
It was a surreal experience- most of the people at the Q and A were typical hobbyjoggers asking hobbyjogger questions. Looking for "the secret"...the difference here is that the Kenyan guys couldn't even wrap their mind around how overly complicated these western runners saw the sport. In their mind, running is so simple. You feel your body, you trust yourself, you do your best, and you don't dwell on it. But that is SO HARD for a Western athlete to grasp! Our cultural DNA is just so diametrically opposed to that attitude.
What we drill into every kid's head in school and in life is just the opposite of that philosophy. Control this, quantify that, worry about all this other stuff. Life in Kenya, while hard at times, is also extremely simple. How's that Buddhist saying go? "Before enlightenment, chop wood; carry water. After enlightenment, chop wood; carry water." It's something like that I guess.
Funny story. I was typical type-A control freak runner for most of college. Never drank, always stayed in and went to bed. You know the type. Had a major injury my junior year and missed all of XC. Started drinking socially that fall, continued to do so in the winter. Raced much more consistently and PRed at 3k by 15 seconds. Now I'm not saying everyone should go get hammered, but I think other posters are on to something with regards to spending mental energy worrying about all these little details. Letting go is good sometimes. Have some fun in your life.
My most consistent runner ever had only 2 bad races his final two years of high school. Before race #1, his grampa died. Before race #2, his parents told him they were getting divorced. You can't ignore the other stuff that happens in your kids' lives. It's not always a physiological or pacing or training related situation when someone runs poorly.