I think the reason UIUC is hard to get into for computer science is because US News ranks it fifth in its list of best grad schools for computer science. I think a lot of students are using the rankings as a guide for where to apply. I feel sure that you will get into most of the other schools with your stats. Btw did you mention in your essay anything about writing software for fun?
It is not a safety non low match at the first place.