With RTTC and fast healing the job is pretty much done for you, if anything slot it like a normal tanker, until you can afford some IO sets. Slot RTTC and Fast Healing accordingly. Trust me I have a lvl 41 WP tank, I have still yet to slot IO's and im running TF's with 0 deaths.
"If you can make a girl laugh, you can make her do anything"
"You're like Giraffe's, the way you look down on me, with your vegetarian scorn."
If you're talking about set bonuses, I'd prioritize hit point bonuses. That plays into your regen strength, while enabling you to survive even bigger alpha strikes, whihc +regen alone won't help you with.
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Should I slot for +regen, or +Def?