That is a very difficult question to answer. Having had no personal experience with deaf schools, I can't say whether I would have liked it or not. Since I started making connections with the local Deaf community in 2011, I have had conversations about deaf schools with some people. Some of them envy the fact that I went to a regular K-12, saying that I "got a better education than they did." A couple people mentioned apparent "problems" at the deaf school, but would not specify what those problems were, like it was some sort of secret.
I don't really understand what they were alluding to. Initially, when I first looked at photos posted on Facebook about their life at the deaf school, they all seemed to have friends, sports and all the rest. A pretty normal student experience. I was kind of wishing I had had that. But then I realized, it wasn't the *place* (the deaf school) that I wanted, it was the openness, the access, the social scene. The fact was that I was in a bubble in the school system, but if there was a proper deaf/hoh program at a regular school, that didn't have to be.
It was kind of odd though, me wishing I had gone to a deaf school, and a couple of them wishing they had gone to a regular school. Maybe it's an example of the grass is greener on the other side of the fence, but it gets mowed down anyway.
My parents told me that they did not want to send me to a deaf school because they did not want to "break up the family." Moving there would have meant moving to a tiny town in the middle of nowhere, because that's where the school was founded in 1890-something. Very poor job prospects and very small town living.
It seems to me that there is nothing inherently wrong with a regular school, provided that there's a program there for deaf/hoh students that doesn't deny them the use of sign language and that allows them to have deaf/hoh friends.
For my own part, being mainstreamed meant that I was in town with my family, close to my grandparents. I had very few hearing friends (actually, only 3. one lived on my block, one was in my church and boy scouts, and the other was a friend of the second one), but I ended up with a couple in high school that I did some things with. Such as Boy Scouts and sport fencing. However, I was also vulnerable to whatever hijinks a hearing person might pull, because I couldn't hear them and was a bit socially naive for my age. (As one would be if they could not over hear the stuff kids say to each other and work out.) I'm probably still socially naive today. I'm constantly blindsided by social stuff in the hearing world. I literally never hear it coming.
Maybe I would have had more hearing friends, if I identified publicly as deaf/hoh. As it was, I was actively discouraged from considering myself that way (I was told I was Hearing Impaired, not Deaf), so I really tried hard to fit in with hearing people, and not let on that I had no idea what was being said or what was going on. I followed other people around a lot. If I didn't follow and discover what was going on by sight, I would have been completely left out. Well, truthfully, I was left out anyway.
I also was not in much of a position to be as choosy about my friends, because dropping a hearing friend meant being that much more lonely. Given the choice of putting up with a "friend's" BS towards oneself, or being lonely, it is tempting to just put up with it. I got into trouble sometimes because of this. That's why I suggest that your kids have the opportunity to being around deaf/hoh friends. It doesn't have to be at a deaf school, if there are some locally.
Being in a hearing school meant that I made connections with hearing students, some of which persist today. Not necessarily as "friends," but as people you keep in touch with. Facebook has been great in finding people who used to be in Boy Scouts, or in my classes. I never hung out with them back in the day, but I learn about what they are doing and stuff. It just seems to add to one's world. The reason I'd say this is of note is because it seems to me that hearing and deaf cultures don't seem to have a lot of cross-pollination. So knowing more people in either community is helpful, I think.
(Edit) In short, I do wish things would have been different for me growing up. But it's really centered around access, communication, social life, etc. Deaf school or a solid deaf/hoh program in a regular school... they may all be great, as long as it
delivers. Deafness is something that produces loneliness. That will be one of the biggest problems your children will face, unless there's something in place (a deaf/hoh community) to fill that need.
As for CI or not, I'm not touching that issue with a ten-foot pole.
There are some deeply divided opinions in the community about that. I have absolutely no experience with CI's and can't say one way or another.
I'm sure it is very tricky trying to balance all the pros and cons of staying or moving.
I think the key thing is access and a social life. Deliver those two, in any school and home environment, and I'm guessing your kids will probably do okay. Especially with loving parents who are so involved in their lives.
Good luck.
(Edit) All of this is just my
opinion based on my experience and personal thought processes. Your mileage may vary.
I don't have all the answers... I can only try to impart what it's like being deaf, and impress upon you the importance of full access to education and social life. It's all about communication. It's all about preventing the extreme loneliness that many deaf/hoh people deal with. That's what I think.
By the way, I'm also 80db/90db, same as your son.
Good luck. I know it can't be easy figuring this out.