Swap out war banner for flaming banner I think - Plus 1 combat res won't make a difference - with that unit you either win by a huge margin or lose by a huge margin!
Here's what I would have done:
1) Dropped command on the Boars and given them additional choppas - and not big uns - just a cheap flanking unit
2) Made one of the infantry units Big Uns
3) Lucky head vs stunty basha for the level 2, just give additional choppa to big boss leader
And then run at the enemy and throw lots of dice at their face!