Man Of The Atom : Incredibly powerful need not always mean INCREDIBLE physical Strength.
Look at the Molecule Man, Dr Doom, Silver Surfer. They have powers and devices at their command..and though the Surfer is strong, Superman is stronger than he, but the Surfer has the power cosmic at his command. Hmmmm..that might be a COOL fight between them! And Dr Doom, and Molecule Man.......
How about if : Lex Luther creates a brainwashing Gizmo where he uses it on the Surfer to make him think Supes is an evil alien, come to Earth to rule it? And that he must stop or kill Superman now.....
Molecule Man can do much damage with his power over the molecules over inanimate objects, and he only as strong as you or I, physically.
Dr Doom, same thing, except it is his scientific genius that makes him most dangerous..and his ego, and lust for power.
