Stryker, Jade, and Sheeva have similar damage output, the most I can get on reliable BNB's with Sheeva is 34% without meter, low grab is very situational to the point that it really shouldn't be factored into her damage output.
Sheeva can get 4o% in the corner, but as is the case with her low grab, it's very situational. Sheeva has not been compensated for being so slow, I would be 100% okay with her speed if she had the best( or one of the best) damage outputs in the game, she should anyway, she's a powerhouse grappler..she wasn't properly compensated for her weaknesses, which is why she struggles so badly in this game. Stryker can get 40% midscreen though.
Faster characters should have a lower damage output than slower characters, that seems like a logical, common sense balance issue.