Been working with this ever since I saw the Sacchin vid where she super armors the sheild counter. I tested this out with WarcC.
Ground: After being sheilded, instead of holding up back, try doing sheild bunker (costs no meter!) for knockdown, or 623C/214C (623C is best damage). Geass ring won't work, it isn't invincible on startup. None of the ground normal teleports will work either.
Air: If you have the meter, cancel into 214C. If you don't, you can cancel into any of the air teleports to avoid it successfully. J2C will also super armor through the counter.