I like the balance overall -- best I've seen in any mod, IMHO. Only thing I generally quibble with is that cavalry units actually get hung up on skirmishers. Maybe it's just me, but a squad of hippeis should carve through akontistai in a matter of seconds, rather than taking 20 percent casualties in a 2-3 minute melee.

Of course, I'm not sure if it's possible to do a "negative bonus against cavalry" characteristic.