I've been running 4 bards also currently lvl 14.

went full bard and found while its great to have SO much healing, the anthem heal along with cand is amazing but stuff doesn't die fast enough for my liking (great for PvE however)

x4 Sab is definitely where it is at for pvp. the slow bomb on a round robin while spamming the AOE bombs is really insane. VERY mobile spec