Techincally Juggs wasn't overpowering WWHulk, but they became evenly matched when Cain Agreed to be Cyttorak's avatar and go back to being a dick. Because Cyttorak became so interested in micro-managment he now cares if you fight for a good cause or selfishness, merely fucking shit up isn't good enough.
Anyhow, earlier Cain was nerfed, smaller than the Hulk, and Cain was not much stronger than Colossus. Hulk was swatting around Cain easily.
Cain agreed to once again serve Cyttorak, by being a dick, like a conversation in his mind, then suddenly grew much bigger and his old costume and helmet magically appeared again.
Now, as both Juggs and WWH had infinitely upward power again they were a match. WWH said he didn't have all day and redirected Juggs momentum, right into the bottom of a lake some distance away. By the time Juggs got back Hulk was long gone.
So, neither was really overpowering eachother. Unlimited vs. Unlimited = stalemate. Incidently WWHulk was like 1000x more powerful than default strength regular Hulk.