The easiest way to make it powerful is let the explosive of woh can trigger Firebird damage
(just give it a low trigger factor but not 0)
Or give full rune ability to it (which I think it can deal the range problem of the explosive and make DMO woh set a bit stronger)
(but DMO mechanism is just out of date I think)
Or make a new legendary that give the explosive four times cooldown but six times explosive (to deal with the handbreaking problem)
(sry for the poor English)