Brakes squealing on 99 windstar

I have a 99 with 118,000 miles on it. I have done 3 brake jobs on it. The last time, I decided to go with the good high dollar pads from Napa. I also had the rotors turned. I put them on and after about 100 miles they began to squeal loudly. Took them off and took them back. They gave me another set. This time I used the disc brake quiet spray on the back of the pads. I made sure everything was torqued right. Made sure the guide pins were greased up and I replaced the anti rattle clips as well. They still squeal. I don't recall the cheap pads squealing like these do but oh how I hate all that brake dust that builds up on the front wheels. Looks very tacky. Any suggestions?