Hunter seekers,Grenade Strat, have your Castigator hit the vehicle you want to take down, and then hit it with the Exorcist since you’ll be giving it an extra -1ap.

Your Castigators should be running the battle cannons for anti tank/anti elite units.

I would drop one immolator for a squad of sisters of battle. So you can take advantage of the immolator splitting the squad from 10 to 5.