I didn't think as much into it as you did, but I did a track day and autox in the same week. At Lime Rock, I didn't get into ice mode as the XP8s have much less bite. On top of the better pad, I ran mostly in the rain and the pavement at the track is only two years old. Three days later I did an autox in a lot that is over 40 years ago, I was hitting ice mode on and off at the start and end of the run (70 second) with the same XP8. As soon as I switched to the stock pads, problem went away. While there might be other factors contributing to ice mode, I personally believe rough pavement is a big one for me.
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