The 'BRAKING' rear rotor would seen to have managed the heat better than the Slovo front rotor but it was definitely getting hot after the second 70mph to 5mph leg of the bed-in. I think the procedure originally posted takes the aftermarket rotors to the limit of their molecular composition LOL. Expect lesser quality steel with aftermarket rotors if you're thinking to swap out OEM. OR maybe the 'sintered' pads bring it on a little more intense than standard brake pads.
I end this with a suggestion to back off the posted bed-in procedure just a little with aftermarket rotors to avoid the burn. They just don't make em like they used too SHOCKING I know.