It is excellent that they actually have a policy and that they use the IAS (your school automatically gets 2 points our school looses!).
My DS6 is going crazy in 1st FWIW, and they don't start G&T until 3rd/4th. DD9 is in G&T and it is not enough anyway.
I understand what you are saying. I, too, have a doctorate (which I don't actually mention to them), so I am not just pulling data out of the air when I am advocating...it is all well-researched and thought out. My DC are also both DYS. I still have not been able to get anywhere.
Stay strong. Others here have been more successful and may have good advice...I am following (and am here for moral support, FWIW!).
