National Merit Cutoff Predictions Class of 2017

There was a curve - pretty generous I thought for math & reading so maybe CB did take into account actual test takers in setting the curve. But I am not understanding how 215 or 216 is likely to be true 99.5%ile ,

I did just notice that on the online full score report for my son, the total score is 1470 - 99Th%ile & under the User percentile description it says:Nationally Representative Sample Percentile

"Your PSAT/NMSQT User Percentile - National
“Your percentile indicates the percentage of a typical group of 11th grade College Board U.S. test takers who would have had scores at or below your score. The average score for the 11th grade College Board PSAT/NMSQT typical group is 987.”

But we have heard from the various GC reports, the actual national mean was about 1009-1010, so the User data in the reports is lower than actual by 22 --23 points. If the percentile charts (e.g pg. 11) are off the mark by a similar percent (2.3% (meaning actual of 1009-1010 is 2.3% higher than the 987 User percentile for the total Score)?), I wonder what the likely implications are for the percentile charts if CB tried to achieve results & overall curve similar to the past as much as possible. Of course this is still just dealing with the mean but I wonder if there is any way to estimate impact up the curve - I am not capable of the - even have a few cups of coffee! CB – please release the State Summary reports!