Go VIT. Still a new class that people are getting used to, and you'll want VIT over STR for upcoming content. As other players get better geared and your own comfort level with the class grows, you can adjust accordingly.

When starting a pull (assuming single target), Unmend into Pounce into Power Slash combo, weaving Salted earth in there somewhere. You can choose to DA the Power Slash. If you do, then you can do some Souleaters/Deliriums. Otherwise, do a second Power Slash combo, weaving in ogcd's of course. Gauge your hate against your dps players with the party list, and spam souleaters and deliriums (DA'ing Soul eaters when you can while leaving yourself enough MP to recover aggro if something happens) and use Power slash liberally when you feel it best. I personally started with the DA'ed Power slash, and than do two souleaters/deliriums, than a Power Slash, than two soul eaters/deliriums, and than two Power Slashes, and repeat it.

As an off tank, pop Blood weapon as much as you can, spam DA'ed Souleaters, Carve and Spits, and Deliriums as much as you can, weaving in all off globals. Scourge should be up all the time, replace it at 3-4 seconds left.