Saracen Militia suck compared to Dismounted Sipahi lances.

why? because the Sipahi have good moral and stamina and that will always win a fight between the two.

I'd try a combination of hashashim at the front, followed by a mix of JHI and DSL. The Hashashim's 2 hit points will help them soak the charge and then the JHI and Sipahi and cut through the cavalry.