I don’t see anything wrong with Dave’s ranking.
IMHO Amber doesn’t deserve 7.5 ar all. She does nothing but nagging and piling up her issues on Dave. He doesn’t care about her doing his laundary, he can do it as well as cooking and cleaning. The most important thing, that all guys want in marriage, is happiness as well as easy communication and positive outlook. She has nether of those. She makes him unhappy - that’s it. He keeps saying ‘I TRY to stay positive’ but it’s harder and harder for him to do so... 7.5 is a generous score for Amber right now. But it’s an clear indicator of his frustration. And she continues destroying their relationships by driving him nuts constantly over-analyzing and having those exhausting conversations that would drive anybody crazy