In my opinion they do have chemistry, it's a latent one and it will explode after, this is only the build up to it
The chemistry will be obvious once the real love-hate story starts, I mean when Raja will maybe also hate her for some reason or when they will both love each other, here people can't see chemistry because Jr Madhu is pushing him all the way and she means it, when Madhu Sr used to push RK she had feelings for him and before she has these feelings for him it was their hate-hate story and the possessiveness of Rk along with the vulnerability of Madhu Sr made us feel the chemistry, people want to see attraction between Rajbala even if Madhu Jr hates Raja, but it didn't show, maybe only for few seconds in the cobra scene and the kamarband scene, in today episode we saw her care for him when he got hurt.
Regarding Madhu Jr not being in character, I think it's related to what she was before, she never was strong in front of Leelawati and she never used police against AK, but now she is so confident about police and that Raja can do her nothing!
Regarding Raja : I don't know why people see it like if he is a love sick I see it as a man who is seducing the woman he loves and knows he has chances to win her and is also the kind of people who get what they want, and I'm sure he will get it and if you still remember in the end of the Cobra scene, he told her that now the Cobra brought her close, but someday love will bring her close, and he said love always wins, she said never and he said always and both said we will see!
Raja has self respect and ego too, but he witnessed her love and her help during his tough times, he knows the real woman inside her and he thinks she is worth what he is doing for her, he is also very confident about himself and that he can make her love him, actually in today's episode I felt he was testing her and pretending that he got burnt and wounded, and it actually worked she cared! So we should understand that Raja has a different approach but that doesn't mean he is begging her love, I never saw him do, I only see a flirty man trying to get his woman
Another thing is about mariage, Raja respects mariage a lot, we can't blame him if he defends it, what I feel is that he thinks that all what Madhu is doing is nakre and she will one day or another discover that her place is near him
To be honest I was on Raja's side in the last two episodes 😃 I understand what Madhu Jr wants and feels, I don't say she is wrong for wanting to get rid of the situation but I just can't sheer her up because he doesn't humiliate her ( the slap was another story he was emotional about his parents and couldn't understand why she is interfering to save their killer), he loves her only and I want to see their love story 😊
In Sr Madhu's case even with my love to Rk, I was angry with him and I cheered her up because then she was humiliated and she suffered a lot and to give it back to him was a nice thing (I still remember the day she sent him that first aid box I kept smiling and applauding her, that scene was very nice, she bbbed him and Deepali too)
None of us wants tortured, humiliated heroine not even from the hero, but when we know he loves her and it's because the difference in mentality that she is doing this, we keep hoping that she stays and tries to help him to change to the better instead of running away from him