I can definitely see that requiring more than one Power Slash, but it's not because DRK can't hold hate, it's because you're super low geared for week 10 of 3.2 progression. That's fair to an extent, but it's not a point where we can realistically criticize the Job or tell others that this is the "proper" way to play the class or that it's "okay" to miss a DA+CaS when trying to optimize the Job because of reasons that are honestly negligible in comparison. DA+DM and DA+DD offer marginally more mitigation in a single-target encounter than their non-DA counterparts, not least because of the short durations. You're wasting your most precious resource by spending it on these gains, rather than using it for significant damage boosts. Your tank somehow being behind the curve at i203 with 10 weeks of Midas doesn't negate this fact. On my alt character, I have i224 PLD and i220 DRG. My main is sitting on i231 DRG (lots of crafted/Savage drops, ignore this - would be i225-ish otherwise), i216 DRK, i213 SCH/BLM.
How many Jobs are you gearing that your DRK is so far behind? Why are you playing an i203 class in dungeons in the first place, if you have multiple Jobs above i210 (as should absolutely be the case with the Farthings from VA and Lore gear and weekly Midas Normal drops)?
I don't disagree. All I was saying is that if you're gonna trade a DA'd hit for a DA'd CD, trade a DA+SE, not a DA+CaS. If you're trading the latter, you're wasting 350 potency for a marginal defensive gain that doesn't noticeably curb damage intake. That's an entire two hits of your main combo that you just opted not to do now. I don't care what nonsense someone is gonna spit about "low Tank dps" - DRK and PLD can pull upwards of 1000 right now without WAR/NIN out of tank stance and 850-900+ in tank stance. That's significant when the majority of DPS players you encounter in DF tend to barely crest 1k-1.1k, if you're lucky.
It comes down to: Why are you using DA to bolster your mitigation cooldowns in the first place in a single-target encounter? Every boss in every endgame dungeon can be healed 100% with passive heals (regens and fairies) outside of DPS taking stupid damage or tanks eating Vuln stacks. Avoid that and voila. You don't even need cooldowns while out of tank stance to survive easily with minimal healer investment.
I know this, since I often run Experts on my alt PLD with a SCH friend who does 700-800 dps on bosses and never once gives me a single heal outside of Embrace, and I do bosses in Sword Oath with no cooldowns outside of tank busters like Knockout.
Is Hallowed Ground mitigation? It prevents damage completely (within certain parameters). If you count that, you have to count killing a mob as an optimal form of mitigation.