I use that spec (Just change the two points from Rail loader to Iron fist) in ranked and it performs really well. I use it as a offtank/dps but my main role is to protect the healers and occasionally guard nodes when our shadow can't. I run full dps gear with aim augments as the tanking stats in the game are pretty useless for pvp.
Mines a little different than this one too but almost the same. Can't remember off the top of my head but I know my 10 in shield is a little different. Same here, no matter the character I'm always on healer harassment and peeling duty. Full DPS (other than offhand) Noticed it helps damage mitigation slightly and stacking aim as well.