Originally Posted by BGTV8

I have had this in the past when I went to Endless ME20 pad compound. My brake specialist suggested that it was due to the interaction between the pad deposits from my road pads affecting the bedding and operation of the ME20 pads which are an endurance race compound.
I went back to using a fast road pad front and rear (Project Mu HC+ or Ferodo DS2500) all the time and the problem went way. Byproduct is lots of dust though
What pads are in the car for Daily usage ?? I suspect the shudder is coming from the interaction between DD pads and XP10/8 combo on track and maybe it might work if you use a Carbotech DD pad if there is such a thing (I'm in Australia and not familiar with that brand of pad material)