You sound like a great applicant and I think anyone of those colleges is a possibility. I agree that you should look at Questbridge. I think apps are due in August. https://www.questbridge.org/
If you don’t do QB, which does have some limitations, I’d apply to one of them ED or SCEA, if there is one you definitely want to go to and will be happy to attend. If not, I’d take a shot at all of them.
As far as ECs, sure, keep them up as long as they don’t affect your GPA. Colleges like to see you developing your interest, so be involved beyond just the surface level.