May be 90 fpr defence is too much. There is no difference between 60 and 90 naked peasants but towns and castles with good equip will have 1,5 times more players then attackers. On walls. Pretty much. But on the other hand during strat1 we took castles with absurd casualties, now castle sieges will be more realistic I guess.
Reinhardt teamplay makes difference. There is no advantage for AI in recruiting best available players.