Sine wave chase glitch at end of nshot

I have 10 sky panel engines simulating a passing car in a sine wave chase. I gave it an nshot of 1 so i can trigger single passes.

At the end of the pass there is a pause then the first engine flashes low once. I have played with size and length and can't seem to keep the wave from wanting to glitch at the end. Before I resort to adding a ghost fixture to the front of the chase are there any suggestions? Hog 4 PC/Hoglet/Superwidget