I'm running a HSW microedge plus with progressive in each gear, but...
the pause is it spinning and catching up and or over running the shift point and tapping the limiter. more than the cutting and progressing back in the juice.
On a nice clean run it's actually fairly fluid going though the gears.

I'd changed some bits on the n20 filtering and I think it hitting harder, the first pass (no vid of that one) it felt really lame / slow progressing ye returned a
1.67 60 a 7.70 1/8 and 12.18 1/8. (best of the day)
Next with no change it was hitting like a freight train and blowing up the tires in the middle of 1st..
Looking back I think that first run was OK because the system wasn't fully purged.
After the next runs I should have dialed back on the progresses more than I did, but the track was going away faster than I was dialing back.

Shortly after my last pass they cut the track back to 1/8 mile only, to much moister was coming up through the concrete on the big end which was kinda funny because most were having problems in the middle of short end not on the big end

 

damn that nitrous really wakes it up!