[Sarinpa1]

def reducing autohit at a pretty cheap cost, resizable range (and pretty big one at that) capable of hitting multiple enemies

4M would give it the same treatment as needle, ND and such, yeah, would definetly make it less broken

but what I'd suggest is not migitating the damage bonus, but removing it completely

it will still be a rather useful skill to have, after all, can't always buster cannon, because you might be planning a different cannon skill. Will be useful to soften them up and follow up with a cannon skill, or something.