Sword Oath is obviously a huge DPS boost over Shield Oath, and given how this content is tuned more for i110 than i130 + i135 weapons (as groups are approaching rapidly), I think it's safe to say going Sword Oath during low damage sections is pretty viable (inb4 PLD is a tank, not DPS), especially because unlike WAR, PLD retains all forms of mitigation while in this stance. However, my group has yet to experiment much with it, both in identifying the best times to do so and in practicing it.

Given that it's easily 100-150 more DPS during the time you're in Sword Oath (not counting going in and out), I think it's logical that if your WHM can handle it, it's more damage to Sword than it is to throw in WHM DPS (especially because of WHM ACC) by utilizing the excess mitigation as healer downtime.

Likely places for Sword that I know of:

T10, after Critical Rip until the next one or adds
T11, other than when it's a burn on the final add, I'm not sure
T12, I've seen the entire P1 done in Sword Oath so it's possible almost all of it can be done
T13, final phase after Megaflare is a very low damage section, probably worthwhile to switch until Earthshakers

Thoughts? Experiences with this? I've always had an interest in this but I've never seen it discussed here.