Really I see no problem with how the book currently is. The plot is there and there are still many twists and turns that could happen to accelerate it. However, I've had this same problem as well where chapters of my stories seem a bit rushed and I go into a book only because I have specific scenes in my head that I want to write. Personally, since the book is already so far along I would suggest finishing it. But then again if you find yourself having no motivation to finish the book then there's really no pressure and no one's gonna stop you if you want to rewrite it. (I hope this helps and I sound big brained :3)