[gthal]

There is not a lot you can do about this... as you mention it is very likely pad deposits on the rotors and something that is simply common when street pads are used at the track. Give it a week or two of normal driving and it will go away. Outside of the precautions you already noted, I haven't found a way to avoid this (outside of being easier on the brakes at the track) with OEM pads.

I have found that track pads are far less prone to this issue. Also, they are so abrasive when cold that they naturally clean the rotors themselves on the drive home. No new rotors needed... just pads swapped before track days.