What is your UC GPA? http://rogerhub.com/gpa-calculator-uc/
At the moment, your UW GPA and SAT score are below average for most of the UC’s.
You need close to a 4.0 UC GPA and around a 1900+ SAT for a decent chance at the Mid-tier UC’s.
UCM/UCR: Match
UCSC: High Match
UCI/UCD/UCSB: Low Reach
UCSD/UCLA/UCB: Reach
Your essays and EC’s are all part of the application package so lacking in these areas will hurt. Get your test scores up and you will be in a better position