Pain Res + Mericiless Storm was fine
All this doom and gloom and fighting over the return of PS + DMS didn't need to happen. The interaction between PS and MS was was so corner-case and minor to be a joke, and BHVR could have safely ignored it.
IF you hook somebody AND it's on a scourge hook AND somebody is on a gen AND that gen is over 90% AND it was never over 90% before THEN they get a bunch of skill checks. Big deal? Either the survivor passes them all and has a cool clutch moment they can feel good about, or they fail one and that's that. The game wasn't breaking.