Remember, a safety is not a school that you are pretty sure you’ll be admitted to. It’s a school that you KNOW, beyond any reasonable doubt, that you will get into and you KNOW you’ll be able to afford BEFORE you get your award letter. In a perfect world it would also be a school that excites you.
As for SJSU being a safety, CS is very competitive. @ucbalumnus knows their published cutoffs and could answer that better.
Also, if you calculate your capped and weighted GPA, remember Cal Poly is one of the few (maybe the only one) that uses grades from 9th. If they’re good it can’t hurt, but the extra semesters in the calculation dilute the honors and AP/IB weighting.