Do you think perhaps you are chasing two different symptoms...pulsation vs metal scrapping? Once you actually take the calipers off, you might find the cause of your noise and/or pulsation.
For me, I had a scrapping sound emitting from the brakes when I would load the car to the right; especially under wide turns at speed (30mph+). It was a very tinny sounding scrap. It turned out to be the anti-rattle clip (not sure if that's what it is actually called) was rubbing on my rotor slightly. Bent it back/corrected it and all was good.