I agree with all of the above, with a particular emphasis on Motivator, as it maximizes your chances of getting a full 8AP out of your models, especially against the potential 14AP your opponent can throw at you. You also might find something like Flurry of Blows useful, in case your opponent is running a melee heavy list with a bunch of tribal warriors designed to mob up on you. Burst weapons or explosives are also good for that.
Also, coming from a Tribal player who regularly outnumbers his opponent, don't forget to focus on objectives. I generally find myself winning objective based games, even though most of my Tribal Warriors are dead by the last round.