If we want cataphracts to be very devastating I would recommend a revision of the morale system. I've done this with a more shock-based battle style in mind for the EBNOM EDU (considering that there will be almost no phalanxes in it). The idea is for any levy to immediately rout when they're charged by cataphracts.
In line with the idea of a shock-based battle system, I've toned down the numbers of elite units and reduced the speed of melee combat so that flanking and charges are very important in order to avoid attrition fights.
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