Stop bragging about being under weight.
Seriously though not knowing the details of what your robot looks/performs like it's hard to answer that question. I can list possible places you could have missed but I need more info.
Is your frame too thin/weak?
Do you have normally have pnumatics but not this year?
Are there fewer sensors?
Did you use a different drive system than normal?
Is your robot really short?
did you use just the smallest motors in the lkit?
Are you lacking protection/shielding around your electronics to prevent balls from sticking in your robot?
Is your robot not the full 28"x38" that you're used to?
Just some stuff I though of quick.
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2011 Championship Finalists/Archimedes Division Championships w/ 2016 & 781
2010 Championship Winners/Newton Division Champions
Thank-you 294 & 67
2009 Newton Division Champions w/ 1507 & 121
2008 Archimedes Division Champions w/ 1124 & 1024
2007 Championship Winners/Newton Division Champions w/190, 987 & 177 The Wall of Maroon
2006 Galileo Division Champions w/ 1126 & 201
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"If you can't do it with brains, it won't be done with hours." - Clarence "Kelly" Johnson