Generally, I avoid too much fruit on CKD or any ketogenic diet. When getting carbs your looking to increase muscle glycogen levels. Fruits increase liver glycogen levels.
CKD is a body recomposition diet, not a traditional cutting diet, keep that in mind. Ideally you should lose fat during the low carb portion of the week while maintaining as much muscle as possible and gaining muscle back/adding muscle with a training session near your carb load.
About your muscles looking smaller, thats normal, during CKD muscles tend to look "flat" because of the loss of muscle glycogen which holds water. This isn't a diet you can follow a scale with either, depending on how quickly you deplete glycogen and how many carbs you get in during your carb load your weight loss and gain can differ greatly.
You should really read the ketogenic diet by Lyle Mcdonald.