What exactly are you doing for WBTB? I know everyone is different but that works almost every time for me and I very rarely become lucid just regular DILD. Are you at least having really vivid dreams WBTB? I would recommend taking a full hour and then going back to sleep if you haven't tried that yet. It seems to work better than just 20-30 mins at least for me. After an hour up you will probably be so awake that it's more like a WILD.