Had brakes done about 3000 miles ago. They felt tight at the beginning. For the last week, brakes make a 'droning' noise and vibrate when applying brakes and both front wheel covers are completely covered in brake dust.
Brake dust is typical after 3000 miles. You can get low dust brake pads, but they will have trade-offs in brake feel or pad longevity.
Low pitch groaning noises are typically vibrations resulting from contact between the brake pad and brake caliper piston. There are products (ie 'Disc Brake Quiet') that are intended to be applied to the back of the brake pad (between the pad and piston) to absorb this vibration before it manifests as that annoying noise. If that's not it, you may want to have your mechanic re-bed the new hardware.