@londondad I’m an alum at a top LAC. A few weeks ago my daughter had the opportunity to meet with the Director of Admissions. She took the SAT in March and got 1510. My daughter asked if she should take the test again. The Director walked her over to her desk, plugged the numbers into her online concordance table, and said yes.
In my subsequent discussion with the Director, I asked her opinion on the accuracy of the concordance. She said that they have nothing else to go on until the applications start rolling in. If the percentage of applicants opting to submit ACT or old SAT (over lower new SAT scores) is really high, that could cause the new SAT scores they see to skew high.
My take: if that happens it could result in a similar percentile shift as the concordance if they attempt to crunch the numbers themselves.