Just throwing a small wrench in there devil's advocate style. The +30 Strength would equate to about 7.5% to 8.5% damage increase (if you're going from around 290 to 320, may be less a percent if you're higher up). And in Shield Oath, this means you're attacks are generating 15% to 37% more enmity depending on the ability.
Don't remember where I was going with that now.
Also, you can have a set of +Strength rings and strike a targeting dummy for 10 strikes with your Rage of Halone combo, then try it without the Strength to see how it feels.
Taking off my devil's advocate hat, I agree with the Vitality approach if you're rolling more with Duty Finder randoms rather than friends, as you won't know their playstyle, may need the buffer, and they may be too stuck in their ways to see a tank in any other way and may lead to some grief about your HP = less enjoyment while playing the instance.