During my carthage campaign with RTR 7 1.3 with the reduced/changed troop sizes I discovered some issues with rome. On "Large" unit settings the AI at least seems to have Triarii regiments which consist of 33 men. Even for an elite unit 33 is too few as they get constantly steamrolled during battles. Carthage's sacred band is still a 62 men unit so the same should apply to triarii.
Likewise, I understand why phalangites have more men than regular units, though I'm afraid these units seem to be too powerful, especially against the AI.