This actually proves the point that you DON'T need a 32+ to get in, even at selective schools.
The main idea that the AMCAS book proves is that the average OF THOSE WHO ACHIEVED ENTRANCE into medical school was a 32.
ROUGHLY HALF of current medical students did not score a 32+.
I LIKE THE ODDS for those who did well, but not well enough for those sitting pretty with a 30+++ (aka. SDN well)!
I don't mean anything personal against you, but I would say that in general too many people think you MUST meet "SDN standards" to have a chance.
I would be the first to admit that a great MCAT score won't hurt your application, but getting a 29 is NOT the end of the line for any hopes of going to a top 20 school. It doesn't help your case, but if you are a well-rounded student, and you let others see your other great qualities during your interviews, you will still have a shot.
Besides, the difference between a 29 and a 32 could theoretically be three questions total on your MCAT. While this doesn't really matter as its the nature of the beast, it does give reason for schools to allow otherwise exceptional applicants a chance with an interview invite at the least.
You can find many examples here on SDN of students who did well with seemingly random stats. The only thing ANYONE can do (even if you have a 40T) is apply broadly and early. NO ONE is going to get admission handed to them based on stats alone. I'm sure there have been times that seemingly "perfect applicants" have been wait-listed to death at every school to which they applied because they came across as entitled because they made the mistake of thinking they were safe and showing it at their interviews.
Don't base your future on what ANYONE else tells you is good enough.
Every year SOMEONE gets into their dream school with a 29 (or perhaps lower). Be that person.
Good luck with your applications everyone!