I'm not sure where the 50x strength is from, but it sounds wrong to me.
Captain Universe is Captain Universe. Spider-Man, Batman, a dog, it doesn't matter who has the powers. No one seems to understand that Cosmic Spidey isn't any more powerful than any other incarnation of CU. He's just more well-known.
And depsite a few cool feats, Spidey was CU for 5 issues. Yup, that's it.
Not nearly enough time to get an accurate power level.
So the short answer (with any cosmic spidey fight) is: We don't know.
He did lift that barge ship in the water.. He hit a 900 pound person miles in the air with gravity pushing him to the ground and he took on more powerful opponents like Graviton,Magneto & tri-Sentinel.
Captain Universe- Captain Universe generally possesses superhuman strength, flight, X-ray vision, telekinesis, enhanced senses, and a psychic awareness of imminent danger; when a person already possessing one or more of these abilities was transformed into Captain Universe, those abilities were amplified by a factor of fifty.
Barges are also used for very heavy or bulky items; a typical barge measures 195 feet by 35 feet (59.4 meters by 10.6 meters), and can carry up to 1500 tons of cargo