Hi Steve,
I'm not really sure what I'd do if I were you, but here are my thoughts... on the one hand you already lived a very healthy life including your raw-vegan diet before you started this experiment, so maybe your expectations about improvement and detox were greater than what you've experienced. It's like cleaning up a house that's already in pretty good shape. The satisfaction isn't as big as if it were dirty and messy, because there's barely a noticable before-and-after-effect. I'd like to suggest that positive results like improvement of health and a more focused mind come alot more subtle than you expected.
On the other hand there's that disconnection from your family in addition to a lower energy-level than usual because of your doubts about your individual benefits of juice feasting. To me it sounds like this experiment is shaking up some of the fundamental "columns" your happiness and optimism is based on, and there's no logic in self-discipline that disconnects you from love.
Nevertheless, I would tend to continue the juice-feasting for a little while longer. Maybe there's an opportunity here to find other ways to connect to your family - other than sharing meals. I believe you said, you could sit at your desk and work now while drinking a smoothie, so there is the possibility of spending that spare time with your family. I myself barely share any meals with my family, but there's plenty of time to sit and talk while doing nothing else. In some recent article you even found a conversation without eating to be much more intense and less superficial as opposed to everyone "hiding" behind his/her plate.
Furthermore, there's always the option to quit a week before Christmas, so you would be able to get used to eating solid food during that week and share the Christmas-meal with your family. After about 2 months it's reasonable to assume that you have developed a sense for subtle physical and phycological shifts - if there are any in your case -, and your urge to challenge your self-discipline would be satisfied, too ;-)
Good luck, and all the best!