It may help to confirm that the calipers are properly lubricated. That is one of the most important things to do on a quality brake job, but it is often also one of the most neglected.
Any parts that are involved with the caliper moving together as the brake pedal is pressed, such as caliper slides and pins need to be lubricated with brake caliper grease. Any place that the brake pad backing plate comes in contact with the caliper needs to be lubricated. That usually includes the sides where it contacts the caliper slides and the back where the pad attaches to the caliper.
There is also some anti squeel goop that can be applied to the back of the pad backing plate instead of grease and it sometimes works better than grease (make sure you keep it away from tha caliper slides).
If that doesn't do it, it is usually caused from lousey brake pads and you will probably need to try another brand with a different compound.
