In my case it was simply the pads not up to the task, its a lot of weight and a lot of momentum... The dedicated track pads work perfectly in the standard size...
I have new braided lines, new fluid, new rotors etc etc... The pad was the weak point!
I am not saying they wont work as lighter cars probably dont have the same issues, but when you are trying to pull up 1575KG again and again of course they are going to suffer