I have some comments about the arab caliphates lists, if it's allowed.
About cavalry, it's not indicated that abbasiya should only be used by abbassid - Umayad is mentioned instead.
In my opinion, senior ghulams should have veteran ability (professional units), as byzantine tagmata cavalry, for example.
Abid and militia skirmishers seems powerful with C : 8.
I'm sorry there is no option for a buyid list (with an elephant as in DBM army lists, but no abids).