I also tracked the OEM pads two times and have what you described as a "seesaw action" felt through the steering. There is some pad material deposited on my rotors for sure and hope it will go away soon. (I tried to move the car when I stoped between track sessions, not to heat the rotor on the same spot, but still the OEM pads are too soft, too easy to deposte them on the rotor. It's just not safe to track them seriously.
I also go with the Carbotech XP-10, will be installed this weekend. Pagids were my first choice, but anavailable right now. Carbotech will not last for too long anyway.
I don't think you have to bleed your breaks after a few track days (3-4) if you have good fluid like Castrol SRF. At least I will not do it. I always bleed them when change pads but not between.
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