I think a lot of people underestimate the value of the interview. I had always heard (upon applying to med school), that the interview does not get you in, it only keeps you out.
I know of a fellow who interviews poorly, and it took him many times to get in, though his qualifications dwarfed mine.
The key for you, I think, is that you don't emphasize your high marks in the interviews. If I was interviewing someone who kept saying "I scored this high on the MCAT because .....", I think I'd get sick.
Listen, my MCAT score sucked (I didn't study) and my GPA was average for an applicant (3.7), but I went to a top 15 University, and I interview exceptionally well. My letters were fabulous. Those things got me in, I think.
Also, I knew a LOT about the program. I showed interest, which is key when you're on the edge of not getting in.
When it comes to applying for medical school, remember that you're applying, not them. When it comes to some residency programs, often they have to sell themselves to you, but it's not the same with med school.
No offense, but you sound a wee bit cocky about your credentials, and if I interviewed you, I also wouldn't be impressed.
And as for your "regular" guy question. I was the definition of regular when I applied. But I'm friendly. And I made a 45 minute interview last 1.5 hours. And I sent thank you cards afterward.
A friendly person who's a mediocre applicant will get in often before an excellent applicant who's a mediocre person.