[Cobranut]

I have the Dynalites up front and Girling's in the rear.
I've never had a problem with squeal or grinding noise of any kind.

Dirt's idea sounds valid, just be careful to use a light spring. You don't want the spring to gradually push the caliper pistons back, as it could result in a soft pedal when you first apply the brakes.

Another thing, what pad compound are you using? Many aggressive race pads are very noisy, and they aren't suitable for the street as they need to be warm to work properly.
I'm using PolyMatrix-D's and they are smooth and quiet.

Good luck,