Are you recruitable? If not, then it’s not a hook, just another EC. If recruitable, then it could be a significant boost.
You didn’t answer this question. What is your budget? Some of the schools on your list are quite expensive and don’t offer much in the way of aid (UC Berkeley, for example). What are looking to pay per year and will you need need-based aid and/or merit aid? Have you run the Net Price Calculators for these schools?