Main thing I've come to learn is to hit Lustrate immediately as the Death Sentence cast bar fills up. Prevents situations in which the tank gets hit hard enough from the DS where the following auto-attack would finish them off. The game's animation-priority typically ensures your Lustrate/Benediction/etc won't top them off in time if you wait to see how much damage DS lands for first.

Otherwise my group (double-sch) has been fine keeping just Adloq up as the bare minimum with our WAR tank popping Inner Beast every time for Death Sentence. PLD will require more care though for every third DS, since their damage mitigation skills will be on cooldown, but that's where E4E/Virus/Stoneskin comes into play.