“The second factor in unpredictability (and for me much more of a problem) is the “slop”. This happens after you hit the button and when the gears are in the act of shifting. There is an unpredictable degree of arc during which your cranks will be free-wheeling. My understanding of this is that the slop will be no greater that 1/12 of a complete revolution (30 degrees max) but yeah it sure FEELS like 1/2 of a revolution.”
my experiance:
using schlumpf grease at temperatures below 0° (my record is -16° ) its up to 2 revolutions.
using sewing machine oil at same temperatures its max 1/4 revolution.
so do the same as in your car - change oil before season changes
but beware, sewing machin oil rinse out, if you bring the hub in warm places as your favourite carpet…