What tank class are you? If your a van in the 55 bracket your class is underpowered period
I blame this from PTS notes "the returns from critical chance have been increased.
The returns from shield rating and absorb rating have been reduced, to compensate damage delt by campion boss has been reduced."
Translation: PvP tanks aren't underpowered enough, NERF them and buff dps
I have both a powertech and a juggernaut tank. This problem is apparent on both of them, though for the powertech it is significantly worse.