[wakespeak]

I used to have this. I have 0 deg toe in front for brake stability (my current spec). The other thing that caused the chatter was too much tire pressure. Your hot pressure is high. I shoot for 36psi on the track hot.

Otherwise, the front struts need to be in good shape, bushing inserts in the lower control arm/radius rod bushings help hold the wheel under braking loads, and the tires need to be worn evenly and properly balanced. Also how are your wheel bearings? You can check for looseness by jacking up the wheel and putting your hands on the 12 and 6 o'clock, and check for free play (should be none). Lastly I torque my wheel lugs in the air to make sure the wheel is properly seated.