odd noise on new disc brakes
Is there any loss of braking power associated with the noise? Does it feel that the brakes aren't working fast enough? Brakes do make a similar sound when water gets on the rotor for no loss of power.

From what you are describing and because you have realigned the caliper I would suggest your pads may have become contaminated or glazed and therefore not engaging properly. Check the pads for chips, hard spots or a glassy appearance (there may be a toe formed at the leading edge of the brake which is ok). Sand the top layer of the brake pad off until it is rough and dull again.

Also check the rotor for any greasiness (make sure your hands are clean and dry). Wipe the rotor with isopropyl alcohol or other non-residue type solvent to remove any decontamination.

Hopefully this will remove any scraping sound and take you back to the turkey gobble and squealing normally associated with Avid Elixirs.