The difficulty I was experiencing wasn't to do with whether jhana was coming or not, per se
. Instead I was struggling with a disheartening confusion over how to continue the practice. I understood that anapanasati wasn't a practice that let you jump in any old place, that it was a sequential development; however, the impression given nearly everywhere, including the Commentary, was that jhana was to be expected after the first tetrad, that it was in fact required before the sequential development of anapanasati could proceed.
Breathe long, breathe short, experience all bodies, calm the body-conditioner... and then, jhana. So I sat.
Upon reflection, I see that I have been
experiencing piti, I have been
experiencing sukha, but because I wasn't experiencing them as factors of jhana, I discarded those feelings as mere side effects. Thereupon I had no guidance and didn't know that a whole tetrad was on tap and that there were instructions
on what to do at that stage without being in jhana
...instructions that were completely
obscured by hearing and reading that the second tetrad begins with the first jhana, that piti and sukha are only relevant to anapanasati if they are factors of jhana!