When breaking in a new set of fingerpicks, in this case metal ones, I find it useful to take a pair of needle nose pliers and slightly bend or twist the bottom half of the picks, to match the angle of attack that my fingers strike the strings. You'll have to experiment with the angle to determine the amount of bend to apply. But by doing this it gives you a cleaner sound, and it lessens the scraping and clicking sound as the metal strikes the strings.