Green goblin is a really good champ for AW defense. Place him on a enhanced recovery node and he can be a real pain. Red Hulk is also really good now after his buff, although I don't know too much about him other than his heat charges being able to purify debuffs. But 2 solid champs you got there.
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If you need (albeit crappy) regen, use SP2 at the expense of 2 charges.
If fighting mystic and block damage isn't too high, let them hit into your block and you'll build charges that way as well.
Red Hulk can purify poison into heat charges, he is great against Mephisto's Aura.