They aren't cheap discs:

Ginge I ain't been abusing them THAT much.....I never warped a set of discs on my old RST!! [standard brakes]

They seem to warp under normal driving rather than hard use. I recently did a track day after getting them skimmed and they were spot on all day then within two weeks of normal drivving they had started to vibrate again

The discs and calipers which were on before these also warped...I'm sure its a problem somewhere other than the discs and calipers I'm gonna replace the hubs and see if that makes any difference