best place for front grooved brake discs?

[System-G]

I currently have a set of Black Diamond Grooved discs on my track car - 18 months in and 10 000 track miles (including to & from track) and they're still fine - although will be replaced next year.

Anyone who knows my driving and/or been in a car with my will know how hard I am on brakes.

Although I do go through 3 sets of pads a year