I suspect you may be right that even ~400 or ~500 students is too many. This is just an anecdote. I went from an enriched program with a high school of about

I suspect you may be right that even ~400 or ~500 students is too many. This is just an anecdote. I went from an enriched program with a high school of about 500 students, which was quite wonderful, but still had the usual high school social issues, to another enrichment school of about 60 students. It was socially different. Everyone knew everyone well. You had to get along.