IMO Accurate isn't needed, unless you plan to PvP..

Spirit Walk IIRC has a long cooldown, but, not a huge issue IMO.

Resilient + Aggressive works better together from my experience as opposed to Aggressive + Peak Health. I haven't noticed it easier to keep aggro with aggressive, at least not when it counts. Peak Health + Resilient would make a better tank, just make sure you shoot first. I prefer the grenade kit on my tacts so keeping aggro with that and a split beam is easy.