<p>I think your ECs are fine! As I just said in another post, they want to see commitment and leadership in ECs, not a long list of them with no passion at all (sorry but I’ve seen a lot of people like this in CC that were then got rejected)
I think your course load, GPA and ECs are fine, but SAT is definitely low for HYP and a little low for the other Ivies. If you prefer the ACT just go for it and don’t retake the SAT, but take SAT II and score good on them. I don’t know about Princeton and Harvard but Yale says that if you take the ACT, you don’t need to take SAT subjects,
though I think is better to increase your chances since most of applicants have them anyway. You can also don’t apply EA anywhere in order to fix things without lose opportunities, but that’s just my opinion 
Work hard on essays to stand out and good luck! and if your first choice is Yale I’m joying the official SCEA 2017 thread a lot :)</p>