Right Stuff Rear Disc Conversion Setup

I have the Scarebird conversion on the front and the Right Stuff on the rear. I use an adjustable proportioning valve and ran all new brake lines front to back. I'm still dialing in the rears. I had drums before. I've had a terrible time getting the Right Stuff rears to settle in. They growled horribly at first and still do but are improving the more I drive it. I guess they are still bedding in the pads.