Your looking too much at the comic bane,
there's nothing in the film that leads Bane to be this bruting muscle, it's skill. Even Alfred alludes to this when at the monitors with Bruce.
Hell, even in the sewer fight Bane wasn't using force, he was using skill.
Grabbing batman's fists, doging him, throwing him off the walkway. He literally tired batman out before he broke him. The only thing leading to the "brute" aspect of your argument is Bane taking a couple punches from Batman which didn't even phase Bane. But that is more or less Bane showing how ready he was, compared to batman. "victory has defeated you."
So once again, the argument is futile. Either way you look at it, Bane's size matters not.