
For me reduce the number of % casualties is a good option but need change the side of units because armies not based in barbarians are outnumbered in units and can be flanked easy if combats are to long in time.
Reguard support add if i dont remember bad 2 bonus, one is morale bonus (cohesion test) and other is combat bonus, you need a HF unit behing the units BUT for pikemen/spearmen is different because they have their own fight bonus when are over 75% of their force and only receive the morale bonus (is a bonus in cohesion test).