A couple of things...
This school probably has a fair number of special snowflakes. If the school does something "special" for a new kid it could cause a lot of headaches for the admins. I am not saying this should matter but it could be shaping their decision.
My son's school sounds similar and overall it works for him.
Maybe see if you could do another trial day (or two). It is a big decision and when you have a child with unusual needs you are at a disadvantage in decision making because references from other parents are not necessarily helpful.
You could also ask what exactly is expected to be covered this year in each subject. I doubt most parents know what is in each grade. I certainly don't.
Good luck!
