AND I think they are SOLID rotors, no All Clad cookware steel aluminum sandwich. Were those rotors designed to cause noise? I’m being partially tongue in cheek, but the number of people complaining about it is pretty huge.
Aren’t those the XTR rotors? I thought I was the only one that tried that trick. They did last a bit longer, but ended up sounding like a herd of geese in heat. sigh And then I bent one. 
I mentioned that to the head mechanic at the one best LBS, and he rolled his eyes and groaned. ‘No, it doesn’t end up working, and can cause delaminating. grunt’
I’ve used ultra fine sand paper, and a brass drill brush and gotten ‘better’ results, but be very careful that the pads are sanded evenly. Yeah, it’s pretty easy to ruin a pad.
I did try Dura Ace rotors, and they seemed to be quieter. Until they weren’t, but I think they lasted a bit longer for some reason before honking started.
Again, is there a solid rotor for center lock hubs, or do I have to use an adapter to test the idea that solid rotors are quieter?