First of all: when are your attempts at WILDing? When going to sleep, after WBTB, or during naps?

I basically try to do a short WBTB (just getting up for a glass of water and going to the toilet) every few nights, while also keeping up my awareness paired with RC's during the day. That way I can try to WILD every few nights, while also getting the added possibility of DILD.
As to how close you got. I have read before from people complaining about their eyes opening up, and read something there about trying a sleeping mask. Can't find the exact thread anymore but it was from today or yesterday. It also sounds as if you're trying a bit too hard, which is usually quite destructive for your attempts

The flashes and other things you saw sound like HI to me, and if you indeed got to sleep paralysis you might be getting close, yes