I don't know if it's possible, but overheads should ignore cav shield forcefields, or reduce it or something. half the time you stop cav with it, you can't finish killing their horse because of the huge forcefield from the shield blocking all your hits.
also shield breaker would make it way OP, right now it's main (only big) disadvantage is that it takes forever to kill any shielder who knows you're there.