Since no info was forthcoming, I decided that I must test it myself.

I achieved parity between Julii and Brutii peasants on Very Hard by giving the Julii +2 weapons and +2 armour. (Tested on Arcade to eliminate the morale and fatigue issues)

What is strange is that giving them +2 experience (which should give the same bonuses) makes them superior to the Brutii....

In any case, I´ll try modding +2 attack and +2 defence to my troops when playing very hard to negate the AI bonuses. As for the morale bonus, I´m going to have to hazard a guess that it´s in the +4 to +8 region...going with +4 for mine.

I´ll test out a game with Greece with these settings.