I feel for you and your DS, petunia. It doesn't sound like your current arrangement is working for anyone. I feel compelled to point out how asinine it is that the school deems your DS too "immature to grasp the complexities of LA reading/writing" when he is profoundly verbally gifted according to his VCI. That to me is a red flag that they completely don't understand him and he is not getting what he needs there. This certainly merits some sort of further investigation.

I am wondering if his VCI is even higher than reported due to his two 19s. Did your tester look at extended norms?