Wow! That's exactly what I decided to do next couple of days. And with the exact delay time - 90min. I noticed that my first dream (after WBTB) lasts about that amount. Later there is another and so forth.
I agree - why not to try it again the same morning? I managed to WILD succesfully ( during first sleep after 4.5h WBTB ) a couple of weeks ago but nothing happened since then
About the position - when WILD worked I laid on my back about 40min then turned to side and very quickly had HI and the rest.
My timing looks similar - I visit WC and come back to bed to WILD without waiting. I've never tried WILDing in the bathroom though
Good lucky LDs then,