Hi Shelly,
Welcome! You son sounds very sweet. Good luck figuring out next year. Homeschooling might be nice if it gives time to continue the work on the visual issues, and takes the brakes off DS's exploration.
Is the current school willing to consider subject or grade acceleration? If both WMI and PSI are accurate scores, I can imagine one frustrated kiddo! Those could either be a result of ADHD or the cause of the appearance of ADHD, I've heard it called 'racecar engine with dunebuggy breaks and steering.' Does that sound like your kid?
My WMI is my bottleneck, and I compensate with some novel tricks to get stuff into long term memory before it 'falls off the workbench' of my mind. That can look like divergent thinking sometimes in me. I just HAVE to make associations - divergent though they may be - or risk losing the information altogether!
Hope that helps,
Grinity