Warped rotors will cause a pulsation. (50 years in the business) Rusty is correct, these rotors need to be turned (fine feed rate on the rotor lathe) and a non directional finish added.
He "MIGHT" could try like a rolok wheel on a die grinder and give a swirl pattern on both sides of the rotors. That might get rid of it. But most of the times, I've had to just turn them. Just like you said. Nice and slow.