I could respond to your R’ Chaim quote with, “Do you think you know the Sugya better than the Maharal to say anything to the contrary?”
For that to even be remotely plausible in the first place, you would have to assume that R’ Chaim is arguing with these rishonim/acharonim as opposed to understanding them differently.
Even granting that, though, your analogy is anyway fundamentally flawed — you taking on R’ Chaim is not in any way comparable to R’ Chaim taking on the Maharal whatsoever — when you have legitimate Daas Torah like R’ Chaim does, then you’re entitled to argue. Furthermore, R’ Chaim isn’t assuming the Maharal etc blew pshat — in arguing, he’s merely saying that he cannot understand how he gripped the inyan, and therefore paskens differently, just as the rabanan said about R’ Meir (Tanna).