This was made with Flooding in mind, so I hope it's balanced...I gave it the higher initial attacks so you couldn't just block it off. But even now, there are means to abuse it with Antimatter and Qui+SoW+Reflect.
I don't understand how an arbalest could 'flood' its adjacent spots...........Anyways, I think you should lower down the attack, makes it more useful.
As in 'I would more likely use it.'