Soo - do you try to WILD after WBTB?
I have an idea for my next try - didn't yet succeed - but I kept trying on my back - and that is not how I sleep.
So now next time - I plan to try it on my stomach.
Just a thought - maybe you also use another than your usual sleep-position?
I had one DEILD two days ago - and it came from lying usually - also started with optics of a "ground" towards which I was facing.