I have always been with the school of thought that you should not pair new rotors with new pads. Break in the pads on old rotors and then switch to newer discs. With track use, I never have them turned. They begin to stress crack at stcok thickness, thinning them out will only make the stress cracking worse.
If you have glazed the rotors, generally this is caused by over heating the rotor, they should also not turn color (blue or white). If this does occur, I would replace them. Many time you see the glazing on cars that have the discs in the wheel to prevet the wheel from getting dirty from brake dust and street cars where the driver tends to rest their foot on the brake pedal.
If this occurs with track use, try to adjust your braking, shorter braking zone with more pedal pressure. or move to a more aggressive pad.
If I had a dual duty car, I would just swap out the pads, leave the rotors alone until the are cracked or severly grooved. This is for no other reason than sheer laziness
