Couple of simple recommendations for BGs.

Don't have a main, use a focus system to switch focus to whichever toon isn't CCd. If using keyclone, just add whatever key you only want the currently controlled toon to use (PvP trinket etc) to 'do not pass' list.

Play defense No seriously, the biggest disadvantage you have as a boxer in BGs (or anywhere really) is the inability to independently move toons on a whim. So, park yourself in a tower or a choke point and defend it. As a shammie this is about as good as it gets in AV. Drop 20 totems (or 15 and 5 elementals) and wait for them to come into your house of elemetal pain. On the move, you will get into more trouble with LoS, and CC as they can see your group coming a mile away.