Andi, It's terrible that your dad continues to alienate you to the extent he does. Maybe if you looked at it from a different perspective, your pain would be less. (Maybe not)
My dad isn't a JW, but he continually does and says things that translate into rejection of his children (except my brother). It sounds to me like you actually have BETTER communication with your father on a personal level than I do with mine.
I'm sure there are many people who don't communicate well with, OR feel loved and accepted by their parents. It seems like you and your dad suffer from this more in that regard than anything directly related to JW's. (Other than that is what HE believes and you don't)
At least you can talk to him about deeper aspects of your differences on some occassions, which is more than I can say about my dad. (((HUG)))