I’ve thrown the plan out of the window
It wasn’t working.  I really needed an epiphany and I was getting nowhere fast.  So it was time to really up the ante.  This evening I did a monster practice as follows:

The entire series for Level 3, using 8 different words for the 4 horizontal and 4 vertical [...]

Not at the same time…yet
So I tried Level 3 normal with my eyes closed yesterday (or at least, it was recently, given my current sleeping patterns words like yesterday start to get a bit confusing).  It turns out that it was just enough to get me wobbling and having to work on my balance without [...]

I’ve completed days 5 & 6 over the last two days, but today was a family get together which required an early start, so I didn’t fit it in today.  That’s ok, I’m going to finish this trial soon enough!
So I tried the breathing technique with my two variations for Level 3 and actually managed [...]