I tried playing the game from the beginning, and I still had the same problem with Zoe. Her level is maxed out at 10, but no matter how many times I have sex with her in the morning, her affection stays at 7.
Some of her repeatable scenes give affection points, such as her bathroom one. I started modifying the UI, so I won't release a bugfix until it's done because I don't want to release a half assed patch. Just try her repetable scenes
