Just reading all these posts ^^^^^ and i have so further info to add but please do correct me if i am wrong
i ve got mine sorted now after racing at 3 different tracks this week!!! if you put on the thinner front 25 degree spacer (with triangle hole) you need to put on a 2mm washer under the ball stud to get rid of the bump steer.
If you have the thicker spacer you dont need any washers under the ball stud. Also having the thinner 25 degree spacer reduces the cars front end twitchiness of the steering.