I just put on my new alth rotors with new gold galfer brake pads. I had a problem with a bad shudder when I tried a different set of these pads with my stock rotors under hard braking. I put the stock pads back on and the problem was gone. Now, with the new setup which is supposed to work a still giving me a hard shudder at low speed hard braking. They work well till about 30 mph and below but it gets pretty violent which is no fun. What should I do, I'm assuming it's the pads not working well with the rotors but which pads should I try. Thanks for the help and ideas.