I beat Act 5!
Aaaaa!!!
I'm so happy! I don't know how but I just breezed through act 5.3 and 5.4 after weeks of failing, and beat ultron in go! I forgot that Void reverses healing and power gain so I didn't have to worry. Man, it was so fun though, especially with all the challenging bosses and fights.
Can't wait for the challenge Act 6 brings, cavalier, here I come!