FWIW, I occasionally had problems if reels were not 101% dry, and particularly in warm conditions when hands were damp or perspiring (and. if you get agitated or flustered, hands get even moister). Light cotton photo gloves are a possibility.
I see that you've practiced, but, for anyone who hasn't. it's worth trying with a scrap film, both in daylight then in the darkroom.
(Apologies if that's all obvious).