perhaps try something radically different?

what finally broke my 4 month long dry spell, was a WBTB attempt at 6:45am staying up for about 20 minutes. i had an amazing marathon 2 hour lucid session. i wasn't even trying to get lucid either, i just happened to have to get up at that time, and when i went back to bed i was in just the right frame of mind.

so, get creative with your methods, and keep trying! if i can do this, then so can you.