Then we tried working yarn at different treadle speeds:
and at different ratios:
Finally, I was able to prepare and spin a few samples of specific yarns, designed and properly executed, including sock yarn (3 ply, 21 wpi, other values measured but not being reported here):
and lace (2 ply, about 32 wpi):
So I'm quite happy. Or I would be if only I had time to spin.