OP, who do you think is giving you feedback? The parents trying to give you advice have kids accepted to very selective colleges. They have been here awhile and have seen it all. I’ve got two kids who went through this process myself.
Good luck OP.
I doubt adcoms will routinely refer to a concordance. I suspect roughly 700 will be the benchmark and then trouble: the rest of the app. Remember, kids get a review in average well less than 20 minutes. It takes only seconds to initially look at scores. The rest is what defines. Or not. And generally, not.
A hint of this insecurity can do.more damage than a few extra points can overcome.
I know that’s not what OP asked for. But a balanced perspective can help in many ways.
I have a feeling that no one is going to be able to help answer my question and it has gotten very off-topic, so for all intents and purposes, this thread is closed. I will not be looking at it, nor responding to it.
If you do have an answer to my specific question about SAT prep for someone who has already studied a ton, you can feel free to pm me.
Your question is easily google-able. Have you done that? For example,
http://talk.collegeconfidential.com/sat-act-tests-test-preparation/1611368-improv
http://testprep.about.com/od/SAT_Scores/tp/Improve_SAT_Scores.htming-sat-score-by-100-in-one-month.html
https://www.google.com/search?client=safari&rls=en&q=Improving+SAT+Scores&ie=UTF-8&oe=UTF-8#q=Improving+SAT+Scores+site:talk.collegeconfidential.com&safe=off
http://www.sat-coach.com/tips/
http://www.princetonreview.com/college-advice/improve-sat-act-scores
https://magoosh.com/hs/sat/sat-scores/2015/how-to-improve-your-sat-score-by-200-points/
http://reasonprep.com/how-to-achieve-from-1000-to-1600-sat/