Try lethality operative/dirty fighting scoundrel.
Yeah concealment just isn't worth it since the 2nd nerf for pve or pvp. Lethality is better but the rotation is overly complicated and not user friendly (FOR OPERATIVES).
I still play my old operative main from time to time, all it has is pvp gear since i gutted its pve set for my gunslinger. These days I much prefer lethality in pvp since concealment is tied with vengeance for jugs as the worst dps spec in the game right now. Lethality definitely has its teeth but I don't think most people are smart enough to play it like I do.