Hello,
I just finished an immortal Shaim and Khazad game on your mod.
I was quite surprised to see bronze warriors, after all the discussion(and poll) in the forums about how important it is to balance warriors and remove their bronze weapons.
I liked the idea of archer/siege weapon bombard, though i found it a bit overpowered in this implementation, and trebs even more so. bringing units down to 50% or something like 15% health before a battle is a HUGE difference in combat odds. that means you can beat man at arms with a simple warrior or adept. I also only once was retaliated from archer fire(i think it was barb archers), usually the other civs didnt bombard. I just conquered the world with a stack of 6 trebs, and some random units of insignificant strength there to clean up the exp from the enemies at about 15% strength. I'd reduce the max dmg, and dmg per volley a bit to make it more reasonable. seems like all you need for Khazad is 6 trebs to take over the world.
immortal became a walk in the park after i could use the super-powered bombard. I imagine Deity wont be much harder, simply cutting units down to 50% health with archer bombard and they cant attack fortified cities, and are easy to break their cities. no need even for siege weaponry/magic.
I think you have made a lot of nice changes to add some unique features, and further differentiate the civs, though Id advise you to work on the balance a bit. I might give it another couple of games, and then go back to the base FFH (with small modifications like bronze weapons removed etc)