Well I can not comment on the metallic pads, I have ceramic myself, but I know my R1's are not making any noise like that. Its hard to say, but I would lay money on the pads more than anything else being your problem.

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James Shafer 2003 GP GTX St. Louis MO
1.9 Modified Rockers, TOGs, 180 Tstat, PRJ 10.4 Wires, P/P Gen 3, SLP Ram Air Hood/Wizaired CAI, Gen 1 Spoiler, 3.5 Pulley, 18" TSW Mondellos w/ AGX Struts, SSC Gen II Springs