Did you machine your discs before putting the pads in or at least rough them surface up with some course 50 or 90 sandpaper ?
I put EBC greens in my car recently without doing anything to my discs because they are in great condition. Now, my breaks squeal a bit under light breaking until I get some heat into the discs, then it's all quiet. If they do start to squeal, I'll machine the discs.
In my 32, I used to get brake squeal everywhere except the track with Winmax, NISMO, Ultimates and Endless SSS pads ( had machined discs or new discs each time also ) so.........
I cleaned "everything" I could but still...........