ELH,
this is so sad.
It certianly is true that a good bunch of friends is a wonderful thing, BUT
If you son is as you describe him, they you have to do something. Is a subject acceleration in English or Science or History a possibility?
If the only next step is a full grade skip,then you can offer these choices -
1 hour a night of Afterschooling at what you consider to be his readiness level.
2 grade skip at the same school
3 new school, with or without the gradeskip.
Remind him of all the homework he will never have to do!
We have BTDT, and socially it had a high and painful cost, but even our DS12 recently looking back agrees that it was 'the only way.'
Love and more Love,
Grinity