I go through on average 1 set of disc's a year due to warping, different type of pads and different makes of discs make no difference, this time, I've got drilled and grooved, bed'd them in and then hammered the braking to heat the disc's up, and then had them skimmed, once discs have been reheated, they don't warp again, (so I've been Advised By a Local Garage), will let you know in about 6 months as they've been on for this length of time so far,