Wow, did not know Mileena's blocked roll was still considered "ducking stance" when it bounces up. I have the hardest times with low grabs online, especially when someone is chipping with 3, 3, etc. Just wish it worked on Sub's ice slide since it looks pretty low to me.
I tend to save my meter for Enhanced Walk-n-Grab by itself without combo, just to say, "Sorry, coming through!" I figure three bars means three good chances to do 22% each. I usually get 2 out of 3 Enh Walk-n-Grabs which is 44% damage. My X-ray seems to miss half the time, and even it hits, that's three bars for ~ 31-33% damage (I can't remember exactly). Plus a couple Enh WnG's tend to really rattle people out of their momentum. The Enhanced Walk-n-Grabs are really my Ace card, and it's nice to have at least 2 to change the tide. Between that and F4, Sheeva feels like a steamroller to the unaware.
I like B2, 1+2, air grab but the B2 seems to get hit by high attacks which is frustrating for such a slow low attack.