How is a 4.0 unweighted GPA in hard courses only top 8.5% class rank? Is there both huge grade inflation and a lot of rank gaming going on in your high school?
UT Austin would be a reach for anyone outside the top 6% (and admission to the school does not necessarily mean admission to CS).
UCB admitted 38% of applicants with weighted-capped GPA >= 4.20 for fall 2019, according to Freshman fall admissions summary | University of California . L&S is the largest division and admits undeclared; you then need a 3.3 GPA in the first three CS courses to declare the L&S CS major (about half of the students in those courses earn B+ or higher grades).