Actually, Norman isn't as strong as Spidey, at least from what I've always seen. He's strong enough to make Peter feel his punches, but I don't recall him ever overpowering Spidey or even trading punches on an even basis.
Hell, until Bendis and Ellis decided to start pimping him, Norman's only real victory against another superhuman was Ben Reily, and that was because the writers wanted Ben dead.