[JVN]

I'm pretty sure that most schools of such high prestige are more interested in a variety of activities (at leats this is what I was told).
What else are you involved in?

FIRST makes a great story to tell colleges (or job interviewers), but it is only ONE story. If you answer every question with "Well... back on my FIRST team..." it will lose it's effect.
Hopefully you don't come across as a one-trick-pony.

As far as your FIRST experiences...
I've learned it is best to emphasize:
-Working as a TEAM, not individual achievement (for instance, I'm more than a little scared by your statement "I have also designed several good robots")
-Overcoming Challenges
-Leadership

$.02
JV