I'd put Panic Ploy on Hector, leave Armor March on Amelia if one of them is running a player phase build (like Brave), and the other two Ward Armor.
In other news, for those running Elincia and struggling with Brave Ike, I have put up a build for her on the wiki that deals with practically all of them:
The most dangerous Brave Ike to this is the QP Wrath Ignis variant. There is a chance for Elincia to die to him if he is Atk buffed, +Atk and merged, but those chances are slim and the situation avoidable.
Wouldn't running Pavise make her lose some kills tho? It seems a lot of investiment to kill just a unit.