AFT - I'm wondering if YOU clicked with your son's tester. If so, they can be a great source of information.
As for DH, I'm hoping you can figure out some way to give DH a first hand experience of your son's learning ability in relation to other kids his age. Keep your eyes open, perhaps arrange a family playdate with a family that has a range of kids who span you son's 'ages.' Or maybe dream up a homeschooling unit on 'the stock market' or 'calculating baseball statistics for All Star Teams' or some other subject that DH can be the teacher of?
The good news is that your DH doesn't seem to mind if you do things 'in addition' to VPS, yes?
A bit of Occupational Therapy can be very useful for some of our 'highly sensitive' and 'not into sports' boys - talk to your pediatritian and see if you can get a referal for an OT to look at your son. Good thing about homeschooling is that you have a flexible schedule.
Best Wishes,
Grinity