Abbasid is the weakest civ and needs lots of improvements like better a feudal age and better camels.
One change I would like to see is an improvement to the camel aura. Currently it can be a little bit useful in feudal since one extra armor matters in archer wars. But the aura becomes almost meaningless in castle age and imperial.
But what if the Camel aura was changed:
1/1 in feudal
2/2 in castle
3/3 in imperial.
Then Abbasid military, which is currently have almost no edge, would be decent in castle age and imperial. And you would have a reason to actually go for the military wing.