Interesting point regarding the DA hub stocky, I have never heard that before and can't say I checked when I put them on there. Will have to check it at next opportunity. I do look after the brakes and as said, only having an issue on this car, not the other one which gets driven just as hard although less power, never had this issue previously on the OEM DA brakes before I upgraded either.
I am pretty sure the pads are Hawk HP(S?) if that helps but can't remember exactly.