I will refrain from any suggestions on my account (i.e., from my experience). You are the judge and the jury. I will mention few words here: at the time I was a student, during the summers of 2005-2007 I loved going to OC (of course, for the beaches and tan). My I-485 got approved in 2010. Other words to analyze: luck, database, ethics, DADT.

Ok having said that, I am also curious about how USCIS works in these sort of cases. Ran a bulletin board search and found a similar discussion:

http://www.trackitt.com/usa-discussion-forums/i485-eb/1391133603/unauthorized-employment-used-ssn-filed-taxes-while-on-f1