Giving fully armored horse to Armenian Cataphracts... HELP!!!

Hi again all, it's the annoying modding enthusiast again :D

I want to give the Hai Aznvakan Cataphracts a fully armoured horse like the Khuveshavagane Shahvar and the armoured horse-archers( the brownish armor with a green saddle). I wrote "hellenistic kataphraktoi horse" like the armoured HA as a mount instead of "half armored horse" in the EDU. But against my expectations, it seems to have given my cataphracts an Iberian Lanceari horse, you know with the flower-like thing on their head and blue garments. Now I can see that Lanceari too have "hellenistic Kataphraktoi horse", but isn't it faction specific? If so, why don't they get a horse like the early bodyguard or the armoured HAs? My true reason to give them this horse is to make them look heavier as to go with the 44 charge value I gave them.

This is very important for my ongoing Hayasdan campaign, so please... Thanks already!

EDIT: I kept messing with the EDU and removed the mercenary_unit attribute from the Armenian Cataphracts. As a strange result, they had the horse I wanted but the soldier was the late bodyguard one... And I'm also concerned that removing the attribute may mess with other cavalry units that use the same model... So still no progress for me...