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Apply test optional. There aremany excellent TO colleges. 1400 is a very good score. You will have plenty of good choices with that score. Find colleges where your stats are above the fiftieth percentile. Stop fixating on top twenty colleges. There are a lot of great schools where a 1400 will be high.
My D is a totlal introvert and got into nine colleges. She wrote her essay about a personal experience which made being an introvert a littler easier for her. She made herself likable though. Your essay needs to allow adcoms to see a part of you that they can't see from your app. Half the people in the world are introverted to some degree. You are not alone or unusual. But as you know, it's harder for introverts to make themselves heard. Now is the time for you to work up your courage and be proactive about your future. You can't hide behind being an introvert all your life. You have to force yourself to do things that don't come naturally to you. That doesn't mean you have to do it all the time, but you will have to change some of your habits a bit.
I suggest you post a thread in the college search and selection forum if you are looking for colleges to apply to. List your stats, intended majors, and preferences. Big, small, greek life, liberal, conservative, sporty, etc.... Every college in the country has introverts. My child wanted to attend a small college because she wanted an environement where she would not be just another face in the crowd. She attends a LAC. You might find them appealing. But you need to give some ideas of what your needs and wants are.
I really think you need to contact the school in question for definitive answers. I suspect that this is becoming a very common question and they will soon clarify this on their websites. Remember the new SAT only came out last March, so it's possible they are still refining their own policies. I think if in doubt, for schools that REQUIRE the essay, the safest policy is to submit only test scores with the essay.
I am a test prep tutor, and one of my students did well on the SAT, but got a very low score on the essay. The essay doesn't hold as much weight as the rest of the test, but for a school like Yale, the top choice of this student, a low essay score isn't good. He retook, and got a much better score on the essay, but a lower score on the rest of the test. He will still have to submit all of his scores. Yale doesn't superscore, but at least he knows all of his scores will be considered because he is submitting both tests with the essay. Anyone who is concerned about it needs to get clarification from the college, bottom line.
If they don't recommend or require the essay, they are going to look at both tests. If you send all scores, they will see all scores. If they say they superscore, they will do the superscoring. If they don't give exact, detailed info about how they superscore, which is their right, there is nothing you can do about it. You are overthinking. You will only have a problem if they REQUIRE the essay. They might then only consider the test with the essay. For your schools you are fine. if you are going to worry about non-issues, your hair will be grey in no time. Stop fretting.