It seems as though it's the subtle things through your day that reappear in your dreams. I used to be big on horror films when I was little, one side effect was the nightmares. I developed a technique where, just before I went to sleep I would concentrate on the films, this worked as a way of 'getting it out of my system' so that they wouldn't turn up in my dreams.

Perhapsyour obsession with lucid dreaming works in a similiar way to this. You've always got the topic on your mind and thus your not allowing room for it to reappear in your dreams. I would suggest leaving lucid dreaming out of your thoughts, of coarse you will still have thoughts about lucid dreams throughout the day but these will no longer be your dominent thoughts.