You have in the first post that you have rear camber and toe arms, but no traction arms. How much have you lengthened the camber arm relative to stock?. If you lengthen the camber arm and not the traction arm you end up with a large change to the toe curve during the suspension travel, ie. Bump steer. The wheel will toe out under compression if the camber arm is lengthened and the traction arm is not. So when you hit a bump at speed, wheel goes up, toes out and it breaks loose.
So either put the standard camber and toe arms back in and live with the hektik rear camber (assuming the car is low).
Or
By some traction arms, make a bump steer gauge and set it up properly.