Greetings,
I might be wrong, but I've got the feeling that the increase in cavalry unit sizes has not been accompanied by a corresponding price increase - while this is probably an intentional balance shift in the mod, might I suggest the following:
reduce heavy cavalry numbers back to original (24), but increase attack(s) by 2, defense by 3 (+2 armor, +1 skill)
increase light cavalry numbers to 36. Ridire are medium cavalry, and should use the same number of riders as light cavalry - at the moment they're extremely poor.
Dismounted cavalry units seem to have the above modifications to their attack and defense implemented - I do not quite understand why their statistics are better than mounted knights? I personally reduce their stats to the original knights' level while raising the mounted knights' values.
Just a friendly suggestion from a modder.