How often do you need to deglaze rotors.

I have a 08 GSXR600. I recently put on new EBC Rotors with new Vesrah RJL pads. (750miles total)i had 1 track day on them with no problems. I rode the bike for like 750 STREET miles afterwards and a slight pulsation in the brakes seems to be building up.​Right after the trackday the rotor looked like it had a uniform color on the surface. now there are alternating/pattern spots(slightly diff shade on stainless steel) appearing on the rotor surface.​Does it mean its time to deglaze my rotors with a scotch brite pad?Does light brake usage cause uneven pad build up on the brake rotors surface.? via /r/Trackdays https://www.reddit.com/r/Trackdays/comments/ca2yeu/how_often_do_you_need_to_deglaze_rotors/?utm_source=ifttt