@SculptorDad I think you and I have a dramatic different view of the level of a PG. My youngest will probably end up HG. I disagree with PG kids do poorly in school. My son went to the Summer Institute for the Gifted and out of all the kids there, there might have been 2 kids that were PG out of 50 of gifted kids there. Those 2 kids did awesome in school. I have talked with PG kids. They are like comparing a pro to a Division 1 athlete. Both are rare but the difference is exponential.
@laenen, I consider a child who is 4 grades above in math and does his older sister math problems in his head a profoundly gifted child. If you don’t agree, it’s natural. Even researchers in the area don’t agree with each other. HG or PG, I don’t care about the labels anyway. 4 grade above math puts him in the far end of the bell curve and that was my point.
Also I didn’t say your son, or profoundly gifted kids in general does poorly in school. Mine is profoundly gifted and she does fine. But there are many profoundly gifted kids who do poorly, or at least did poorly in elementary or middle school, often due to the same difficulty that your youngest has and also often because the instructions are too boring for them to withstand.
@SculptorDad I agree that it is not uncommon to find the 2E (ADHD or Asperger and HG/EG) kid that has problem getting the necessary instruction that they need. I also agree that it is not uncommon that some gifted kids in all ranges suffer from boredom and thus act out but in my experience that percentage is probably not more than 10% of all the gifted kids.
RE: 4 grades above being PG. The only reason I hesitate on that my children are in a program called Russian School of Mathematics. And in those classes there are a lot of kids that would test 4 grades above (NOTE we are talking public school grades which are kind of a low standard). Using that population, I just don’t see the 3 or 4 sigma that I would like to see. Even in my son’s public school grade there are a few kids like him. For me, there probably shouldn’t be more than 1 or 2 PG in the whole school of 500 kids for a given subject. If he is roughly tied with 2 or 3 kids in his grade. There are probably 10 - 15 kids like him in the school. That is not a small enough percentage.
We have kind of beaten this topic to death. Although it appears we have a similar background and common experiences, I think we have vastly different views on this subject matter. I respect the fact we won’t find common ground nor do I think either of us will be able to convince the other to change their view. 
@laenen, it was a fine exchange of different opinions. We probably have had different personal experiences as well.
Slightly off topic, SculptorDad, but I just wanted to applaud you for your very even-tempered tone on the boards. Sometimes (in other posts) I have seen people post things that I might have taken offense at if I were you, but you handled them very graciously and you seem very open minded. It was noticeable enough to me that I wanted to point it out.
I wish you and your daughter all the best!
I was thinking about this thread (and your amazing kids and what devoted parents you are), and I just wanted to say something that I’ve said before on these boards, which is that although getting into these schools feels like a competition, it’s not something that you “win”. You are selected, and the schools really try to make good matches. They want kids that will thrive in their environment. Yes, they have their institutional priorities (which in my mind are the real hooks – things that someone else in the school, like the advancement office or the coaches tell the adcoms they need), but everyone – the school, the parents, the kids – is going to endure 4 years of hell if the fit isn’t right. Fit is a million things… Can the school challenge a kid who is not only gifted but has already achieved beyond the level they normally teach? If the child is a top-ranked soccer goal-keeper but the school just recruited the national U-16 team GK last year, will this amazing player get any real playing time? Will your child fit in socially or feel stressed or lonely? If your child’s passion and gift relate to an EC that the school doesn’t offer, will the school be doing the best thing for your child by admitting them?
Our story was that on M10 4 years ago, DS was turned down by the only TSAO he applied to. Yes, his stats were above average for them, and he had good ECs (nothing national, but solid just the same.) Now, having watched how he’s handled the last 4 years, I know what the TSAO school knew then – it would have been a bad fit. I can also say that where he ended up, which was a top choice, has been beyond perfect for him – the person he’s become in that environment is someone that delights and astonishes me. The school that turned him down is better known and more prestigious. But better? In whose eyes? For my kid, certainly not. I remain grateful that they knew better! It’s really hard to believe in the process, and yes, it is not without its flaws, but more often than not, it works out the way it should. Wishing GL to all of you on M10.
Do not worry, you will have very good outcome! good luck to you and sculptordad!! on M10 . I am keeping my finger crossed for both of you. I did not want to post but posted my outcome as we have 100% financial need and ORM kids and still have good results; your kid will just do fine. keep me posted. Good luck.
My HG/PG kiddo is doing great at BS. Most kids with this profile can be asynchronous. Having a high IQ does not mean that the kid is always an academic super star. I agree with SculptorDad, these kids will get the academic challenges/depth/rigor they need at BS, but the social is equally important.