Is Quake from Archeron bypassing Succor's shields for anyone?

[Lyrinn]

Well this is where the ideal setup if a SCH + WHM comes in. Have the SCH go heals on the Tank and the WHM can heal up the raid, as it utilizes their design better.

Plus even if it doesn't mitigate that attack, it at least mitigates the following attack.

The thing about CT is that even one WHM makes the whole thing a joke, let alone WHM/WHM. Regen/Medica II, proceed to ignore raid for a minute.

Are you all 100% sure it isn't just the sheer amount of stuff going on in the field causing the 'barrior buff falls but the icon fails to vanish' error?

I know from experience that Quake III will do upwards of 2500 to a Dragoon set up in full Myth gear.

It definitely goes through the shield. Easy way to check is to get hit by any of his other attacks immediately after and the shield will fall (along with mitigated damage).