Welcome!
First, good for you for recognizing early that the behavioral and physical health symptoms were really stress-related, resulting from his educational situation.
Second, with regard to the range of cognitive scores, unless you see IRL concerns beyond what might be typical of any young child, the particular areas of lower performance do not need to be causes for concern. Quite often, GT learners will think and problem solve (GAI, composed of elements from VCI, VSI, and FRI) at a much higher level than they produce routine tasks (CPI, composed of the WMI and PSI). None of his scores, even the weakest ones, are actually below average. The simplest and most innocuous interpretation of his scores is that he is a very bright young person whose handwriting is no better (especially no faster) than that of his peers.
The variation among the GAI-contributing domains is not of a magnitude typically considered significant. (And it is even possible that the VSI scores are slightly affected by his relatively slower processing speed, and thus mildly low estimates, as those are both timed tasks.)
Sounds like you are doing a fabulous job supporting your son's growth in many ways!
