I would suggest retaking the Physics SAT II and the ACT (the latter is not really necessary, but the former definitely is). Otherwise, your EC’s sound cool and you have solid activities done over the summer. As for the research paper, I would say submit it only if it is either formatted like a legitimate piece (Abstract, Intro, Methods and Materials, etc.) or if the topic is cool and engaging to you. Overall, you’re a fairly good applicant (you just need to boost those scores).