I'm impressed with how quickly you re-read it, I really struggled to get through certain parts. You're right about Rochester being psychopathic. Apparently, his character was based on Lord Byron (who was also the inspiration for the modern vampire - https://eejjbair.medium.com/was-lord-byron-a-vampire-d00f0a6746de). Initially, I was gonna do a post about this inspiration but decided against it. Anyways, if you're interested, this is what Harold Bloom said of the link between Byron and the Brontes:

Charlotte was eight, Emily six, and Anne four when [Byron] died and when his cult gorgeously flowered, dominating their girlhood and their young womanhood. Byron’s passive-aggressive sexuality—at once sadomasochistic, homoerotic, incestuous, and ambivalently narcissistic—clearly sets the pattern for the ambiguously erotic universes of Jane Eyre and Wuthering Heights [...] The Byronism of Rochester in Jane Eyre is enhanced because the narrative is related in the first person by Jane Eyre herself, who is very much an overt surrogate for Charlotte Brontë. As Rochester remarks, Jane is indomitable; as Jane says, she is altogether “a free human being with an independent will.” That will is fiercest in its passion for Rochester, undoubtedly because the passion for her crucial precursor is doubly ambivalent; Byron is both the literary father to a strong daughter, and the idealized object of her erotic drive