Cal Poly SLO does consider EC’s. Mainly hours/week along with any jobs that are major related. It is a minor consideration but they are still considered.
CS has the lowest acceptance rate at around 6%. Although your stats make you a competitive applicant, there is really no way to chance with such a low acceptance rate.
Have you calculated your MCA points: http://talk.collegeconfidential.com/cal-poly-san-luis-obispo/1694769-confused-about-mca-score.html
Check post #52
Make sure you apply widely and have 2 safety schools on your list. Best of luck.