Other than the timed math and the uneducated psych, are you and your son happy with the school? Why did you meet with the psych to discuss it? Is the school concerned about it?
My DS8 is not a fan of timed math facts and his HG SWAS does not do them - in fact they don't even do math facts - the drill (as need be) is done at home. However, last year, his class (regular public school) did do timed math and he was not good at the beginning but got faster as time went by - he did not freeze though. MY DS is also just naturally slow and has an average PSI on the WISC IV. I guess I say this because I don't really think it is that unusual for HG+ kids to be slow on timed math facts and I don't really understand why the school would want to meet about that.
Is this something that the FC could help with? It seems to me that the psych (and maybe the school?) needs some education about PG kids. Maybe your FC would be willing to send an email or make a call?