I'm running AP Racing 6 Pots with export DBA rotors on custom aluminium hats with Ferodo DS2500 for street and DS3000 for track.
If you think the DS2500 squeal, wait till you put in a set of DS3000s :Oops:
7heavn: Have you gotten your discs machined? They might be slightly warped or have formed a ridge from debris between the pad and disc scraping away a groove...
Also I'm not too sure about sanding down the pads... Sure, you can make the face of the pads flat, but how can you be sure you're making the surface level-flat? i.e. How do you know it's not flat, but on an angle so that one edge of the pad touches the disc first, instead of the whole pad face touching the disc at the same time? That would just promote squealing even more!!!