I've got the TKO 600 with a Steeda shift kit (with the stock shift arm). I've found that if I really force it, I'll miss the shift from second to third from time to time.
Seems to be a fine line. Under acceleration, I need to apply enough pressure to quickly shift from second to third, but I can't force it. I think I read on one of the posts that you need to be smooth and guide the shifter and let the transmission do the work. Hard to do when the adrenalin is pumping
.
It's probably like the yips in golf...you start over thinking the shift
.