In reality he's stronger by the meanings that came from Operation Rebirth. The reason behind it was to create "Super" men, men that are superior in stats to top of the line athletes. Otherwise why would they invest in all the secrecy behind it or the funding for that matter.
IMO Batmans peak human is in the sense of a peak-athlete. A man high at the very top of his prime. Just like Daredevil or Shang-chi for an example. I'm sure fans of Daredevil or Shang could even argue they look on paper to have "peak" feats as well. Just like Batman.
But we know Cap/BP/ are enhanced to be above that level. I could show you flashy strength feats of BP hurling huge rocks or bringing down a Rhino. Or Cap lifting up a big statue.
And you would answer with a Bat feat to say this is just as impressive. But in reality if you were to post up most of the majority "strength" feats of Batman. His majority strength feats would look better then the majority of strength feats of even Slade. With Slade having one great high-end feat with the cable.
This does not mean Batman is stronger then Slade of course, once one understands what the character is meant to be and created for.
I agree with you that Bats is peak or even maybe in one aspect. But even that aspect isn't defined by the marvel "potential". But if you don't like my word here is the scientist word. A man unlike the world has "never" seen before-Dr. Erskine
The "Perfect Man"-Erskine