I think you vastly underrate Heracles' strength. He is easily one of the strongest individuals in the entire Marvel Universe. Easily as strong as, if not stronger than, Thor, Sentry, Hulk (unless Hulk is psychotically rage boosted), Blue Marvel, Hyperion (old/new/King/whatever), the Forgotten One and other strength elites. I don't mind putting Ben in that category, but let's be clear that he would hardly be an underdog, if he was elevated to that level.
Then again, most of the other elites in that tier have energy manipulation abilities. So maybe Ben would be an underdog in that respect.