Increasing length of Parabolic pointer in HTC Vive teleportation system

Hi
Has anyone reading this used the HTC Vive teleporter on github?
https://github.com/Flafla2/Vive-Teleporter

I'm trying to increase the length or target point for the parabola slightly so the user can teleport further. Guessing it means altering the actual parabolic curve but the math is beyond me.