It sorta makes sense since Super-Nova didn't really work WITH the Nova Corps, but instead took their power...

For the "steal the power of the nova force" power, if you have already dealt the damage to other characters on your force and on your opponents turn he outwits the power before the start of your next turn does Super Nova still heal seeing as the damage was already applied?

It sounds as if you'd be out of luck, unfortunately. I guess if you're going to use your power for that, make sure to get away where no one can outwit you...

With the new wording on RCE, can you also add the +1 to their attack or is it limited to only adding to the damage?

D10 Nightwing needs range to be able to use RCE (via Hammer or Perplex), but he'd make a nice honorary member of the NC.