I think he means raising the linkage rod to a higher position on the pedal. That will get the pads to make contact sooner but there will be less pressure on the pads for any given amount of pedal pressure.
Some karts have a larger gap between the pads and rotor by design. If your satisfied that all the air has been bled out and the pads are not worn I would set the pedal back stop where you want it and adjust the linkage rod shorter. That will get rid of the excess pedal travel. There needs to be some free travel or the brakes will drag when they heat up.