Brian,
I'm curious.... I see significant under-feed on the way down, especially as the spindle stops, and even more significant over-feed on the way up. Looks to me like it's probably approaching the travel limits of the tension/compression holder. Is the coordination not occurring during part of the cycle, like after the spindle is turned off at the end of the down-feed? Or is the programmed feed wrong for that tap?
Regards,
Ray L.