If you are getting to the last phase GA-100 after the shield you are making the soft enrage. So if there were no deaths, then it's mostly DPS optimization at this point. Like literally after that final whirlwind, people should be getting damage potions out for their DoTs, swiftcast your shadowflare. Plan on who on the DPS is going to hit LB. Do whatever it takes to push. The OT shouldn't even bother running away with the GA if its that close, they should go-ham as most won't ever survive it because of the tower damage remaining.

Of course the fight gets easier once the raid has access to those gobdip 270 weapon upgrades, since the margins for error become significantly less. So it's worth throwing everything including the kitchen sink at clearing.

I wouldn't worry about trying to bait out a Crit Adlo for any of the spreads, the shield is there to cover that GCD so they don't have to stop doing damage. Then immediately Indom once they fall to 1. The AST should be timing their Helios at that moment too and that should top them off for the whirlwind. Sometimes I throw down the Soil too depending on stacks.

ACC is the most importance for any savage healer, and missing things like Energy Drain is the worst. Like any 270 right sides should absolutely be ACC V or VIT V (if capped by other means, like if you have anima ACC to cap can just use VIT melds). Left side mostly if not-all ACC V. So it'll come down to a pentameld right side to cap along with food. Ideally for SCH the best one to use is the crafted choker because it's the best stat weight trade-off, but many use the ring.