My View On Bane
So let's look at this from the different approaches that have been taken.
Minimalist Approach: Downplay all of Bane's feats and abilities to their lowest possible point. Discount any of his nexus feats. Discount any growth that might have occurred over decades of time.
Going by this approach what is the extent of Bane's ability?
He was capable as of RoT of breaking Zannah's neck with TK.
Zannah as a child shielded herself from a fire storm caused by Bane and the Brotherhood's lightning ritual.
Given the extent of the fire I imagine the feat is similar to Anakin Solo's. While I'm sure this was an innate use of her power I think we can be fairly sure that as of RoT with over a decade of training she would be able to replicate and exceed such a feat as it's made clear in several sources Force ability increases the more you test the limits of what you're capable of.
So essentially Bane can overpower someone who's approximately capable of this.
"Anakin reached up and pulled, creating a tube that sucked higher air straight down on him and the Yuuzhan Vong. His breathing eased immediately.
The fire liked it, too. The underbrush exploded like a bomb. Anakin felt the heat briefly, heat he knew would blacken and crack his flesh in seconds. He had not tried to alter energy before, but Corran Horn could do it. Their lives depended on his success. Anakin opened himself again to the Force, focused his efforts, and leached the fire's heat from a radius around them both.
How long he kept this up, Anakin did not know. He slipped into a sort of fugue state, each breath pulling life from the sky, each exhalation bleeding heat into the crust of Yavin 4. But eventually he blinked and realized it was over, that the fire had burned past him and he knelt in ashes." - Edge of Victory I: Conquest.
The difference being Zannah may have actually shielded both herself and Laa directly from the flames. This is the stance I take as I find it unlikely she could have accomplished such a complex technique like funneling air and heat with the Force or employing tutaminis.
This isn't a one off feat either as Zannah has demonstrated feats of raw power similar in magnitude such as TK powerful enough to disintegrate human flesh.
Maxi Pad Approach: Assuming the nexuses Bane was on had no effect. Taking hyperbole and exaggeration as fact. Developing calcs based off the literal words of the author to come to conclusions the author clearly didn't intend. Looking too deeply into the text to see something that is just not there.
Going by THIS approach what is the extent of Bane's capabilities.
Well, this stance would have you place Bane around late Purge era Vader level in Force power as he collapsed a temple when he was injured on a nexus that was hindering him. This would mean similar growth to that of Vader's over the next few decades and due to a few lines where Bane's physical attacks in DoE had the same effect as ones when he was in his orbalisk armor he would be assumed to be equal or more powerful then that incarnation. Once you scale up to DoE the character becomes roughly somewhere above Caedus.
Measured Approach: You can accept his feats for what they are. You can take context into account. You can realize Bane is a decently powerful individual with appreciable growth throughout his life time. And you can put bias to the side. Simple as that.
Taking all this into account you realize he was injured in PoD, that he clearly wasn't benefiting from it and that the DS nexus is hinted at having made it worse. You can also take into account it was amping his Darkside power. This is a feat that places him amongst beings like Decieved Malgus in raw TK. Take into account his growth over the next few decades and you have an individual that can probably replicate this feat especially when you consider Zannah believes Bane in his prime is just as deadly an opponent as a version confirmed to be more powerful then PoD ( RoT Orbalisk Bane ) it makes it pretty clear that DoE is not far behind that incarnation ( RoT Orbalisk Bane ) if at all.