Remember that when you practice WBTB that it's not a technique by itself and won't have an affect if all you do is wake up for a while and go back to sleep. It needs to be coupled with either MILD or WILD.

Also, I've found that for me personally and a lot of other people I've spoken to that becoming lucid in the really whacky dreams is rare. I'm going to assume it's something to do with how involved you get in the story. One way to try and combat this is attach some self-awareness onto your reality checks. Simply question "What was I doing 10 minutes?" and recount all your actions. Another good method is whenever you experience a scene transition in waking life, like walking through a door, you can ask yourself "Is the scene I've transitioned into logical?".