After reading through it and let is digest for a bit. I still hate the hair with a passion and there are a few more things that stick out but I think I can sum up my dislike of the direction that this is going by how servile Ranma has been made. That line from Setsuna about Ranma's future is very disconcerting.
Providing for Hotaru's every whim when an actual nanny should be more parental and not indulgent. She's become more a giant fat bunny plushie than an actual person. Even her reasoning for the hair, which was itself at the request of her friend, is "well Hotaru/Usagi will like it so I like it now too" Ranma is even the one who does all the cooking and preparation for a dinner in her honor. When doing the tests with Ami, there's a brief moment of Ranma standing up that Ami screwed up right before demanding that she serve Ami different/better food. Cheesecake as a SNACK?
What happened to the Ranma who forcibly challenged Nodoka about Genma? Where did that plot thread go? I don't see where this change from reasonably confident, worldly if socially awkward young woman from chapter 1 and more in 2 went to be replaced by an overly shy and introverted servant in chapter 3 came from. No reason for Ranma to be the dominant queen bee, but she really needs to be more than a blank slate to bounce conversation off of to give SM back story or explain the situation in Nerima rather than advancing that plot in any way. Very little actually happens in this chapter that isn't retreading ground from the last like the stuff about Hotaru's past or that things in Nerima are not good for Ranma.
And at some point one of these characters needs to point out to Ranma to stop eating all the time. 1st scene is a restaurant, slight fight scene, then more food with Ami. Next scene with the normal friends has more food in two different parts. Then Ranma is setting up to have a big dinner. None of the others are bloating up and Ranma is supposed to still be training but if she is eating cheesecake as a snack then clearly it's not muscle she's gaining. If Ranma is actually upset about her weight gain as her conversation with Akane implied then an athlete of Ranma's caliper should be able to get it back down and would know how to. Her feelings on the matter aren't resolved enough, is being bigger all over a guilty pleasure so she has no incentive to get her weight gain under control? Some sort of 'look how female and not male I look!' kind of thing? The reasoning behind that is far more interesting than hearing more SM backstory or details on food.