Arch Omega and Paladin

Our group did Arch Omega recently, and after we finished I was trying to think back to our old strategies for omega at 75, since the initial 4-leg phase went quite slowly.

We used to build TP on the (2) PLD tanks and they would open with Spirits Within, and then use Atonement until the 2-leg phase.

My question is, would Requiescat now be better than either a 300% SW to open, or better than atonement spam for non-elemental damage? I didn't notice what WS the PLD was using, but the HP was dropping ever so slowly. And he doesn't speak very good english so it's hard for me to ask him.