I've noticed that there is plenty of "unofficial" clustering going around - perhaps there is an advanced Math class, and then many of those kids show up in each other's classes due to "scheduling purposes." I'm glad you school clusters intentionally - it's needed! Keep us posted, and keep looking for options.

I recently saw a post for an organization, http://www.writeguide.com/
that helps homeschooler's "do writing." Perhaps if the teacher isn't going to do enough for your son, you can take advantage of your excellent history of him having to do "more" and have him do a program like this.

Smiles,
Trin

Coaching available, at SchoolSuccessSolutions.com