I've been told second hand by the player of an arial thief city ties that acrobatics on an arial is damn near immunity to bash. You don't really need it so much for trip since you will be flying.

If gag doesn't stop magi from casting then it is stupid. Just remember that there is an order bindings fall off in battle (I don't know the order) and that the more chaos there is in the battle (the more people) the faster things will fall off.

I'd look up logs of binders on QHCF to determine what order and get a feel for how quickly things will fall off once you initiate combat.