I guess I wasn't clear, Rage Storm is doing the knockback during its channel. I'm aware that it does damage during the channel, but it's not supposed to do the knockback DURING the length of the channel, just at the end. And we're getting knocked back with 5-6 seconds left before the knockback is supposed to come.
No, I am not exaggerating about the glitches we consistently get during this fight. We have one-shotted every boss in the new ops except Underlurker, mostly because it's hard to get a run at him without a glitch. We've tried jumping to avoid rubber-banding, particularly in the cross, and it doesn't seem to matter. Mostly the person in the off-tank position is the one getting hit for ~50K in a green cross, but not exclusively--I'm DPS, was near full-health, almost died from Devastation in a green cross.
Our Coratanni glitches were so bad we don't even try to farm SM Ravagers for Ultimates. We never had her attack the escape pod. Mostly we'd just get her to run to the escape pod, kill Pearl, run to the escape pod, get a loading screen, and be looking at Coratanni and Pearl again. Exit out, run back, and die to grenades thrown through the closed door before we even got into the room. Exit Area, reset the instance, and die to grenades thrown through the closed door before we even got to the boss encounter.