Your rotors don't look bad at all. Those heat cracks are normal with track use. Just need to make sure they don't make it to either edge of the rotor. As your rotor gets worn you will get more cracks. You will likely have to replace the rotor long before it reaches its minimum thickness.
Odd request, can you take a pic of that piston/pad spreader tool in the background? Where did you get that? I'm looking for something smaller than the massive girodisc spreader.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red