If you're in a 25man and have multiple banners I would probably drop the 4p earlier than usual but if you're in a 10man, keep it till 2p or have 3 or so off pieces (if unlucky with tier)
just drop 2p
Use it on cd
SB inside CS (because it hits harder)
DPS should be gimped as storm bolt not criting is the same as moves inside BB not criting (same RNG)