<p>OP,
You’re new here, so it’s great you’re being humble, but no need to push it too far as it only results in a negative boomerang (as you can see by some of the responses). Just be straightforward, you’ve done a great job and stats wise will be in the top of the application pool. </p>
<p>Yes, you have a chance at Yale and no, you should not take the ACT again. Right now you should concentrate on writing a couple of killer essays.</p>