I've used Windcutters with XTR brakes for a year. Not amazingly powerful but no problems, pulsing, noise. The rear started shrieking so I swapped rotors front/rear. No change. I just bought the R1 rotor to try in back. Haven't mounted it yet though. I use 203mm R1 rotors on my DH bike and they work fine.
just to say: "i use rotor X and rotor Y and had no issues" ist completely worthless cause it depends always also on the used caliper and the used pads.
e.g. the ashima ultralight does a good job with my marta and performance pads. but with R1 and original pads i get horrible pulsing.
the alligator windcutter had in the marta less power, but in XTR caliper and shimano metall pads very good power .. and so on.
I wised up and shytcanned the Alligators on my NRS with Magura Marta's. Pulsed up front badly and never did subside. Put the OEM Magura rotors on again and end of the trouble. Lightweight is fine until it hampers the ride quality. Then it goes in the trash.