Not sure if it’s too late but big law at either of those schools is worse than a coin flip. If you’re set on LA and you want big law you might do better with UCLA, USC, Loyola, or another California school.
I wouldn't plan on taking an LSAT in 2019. Harvard, Stanford, and Chicago don't allow for additional LSATs to get off the waitlist. Further, Chicago doesn't allow for any changes to your application once it is complete and have a very strict LOCI template.