As I've suggested to people before who seem to lose lucidity during their dream... when you find yourself losing the grip on that dream, just spin like a top.
For some reason it grounds you in the dream and strengthens the lucidity. I've used that particular technique to extend my Lucid Dreams for a bit longer than usual.
That's a really interesting idea, I'll be sure to try it next time I have a lucid dream.
I recommend that you keep a dream journal and record your dreams as it helps you see frequent patterns that occur in your dreams so then next time it happens, you can hopefully become lucid. It's helpful if you occasionally check yourself during the day to see if your dreaming as eventually it will be a subconscious command and hopefully you will be able to notice something odd in a dream and question it, and once you question it you will realize that there is something weird going on in the dream and then it's when you believe your dreaming that you've become lucid. Keep trying! I'm still working on having an OBE.
I agree about the importance of a journal, I've kept one in the past and it helped a lot (I was a bit lazy about continuing it

) so I'll give that a try again. Good luck with having an OBE, they're really worth the effort they take.