Judging from my long long long experience from EB I the hetairoi are underpowered. They were after all the best cavalry in the world. Only the cataphracts could match them-and that was not always the rule. So when i see the (almost cataphract) seleucid/ptolemaic hetairoi with this kind of statistics i am thinking that something is wrong. The macedonian hetairoi should also be equal to them though less(?) armoured.
So i propose that the defence of the hetairoi should be 27-28, they should have a decent powerfull charge (48 perhaps) and maybe +1 when fighting cavalry. What do you think?