It wobbles because the outer tie rod is moving in front of the rack, when you go past the center line of the rack, it puts the tie rod in a bind because you are pushing and pulling the knuckle back from the center line. If you look at an overhead view, youll notice that when your experiencing wobble, the outer tie rod end will travel in front of the center line of the rack. So if you REDUCE caster, you are effectively pushing your control arm back into the wheel well, this also pushes the tie rod end back enough to not exceed the center line of the rack.
Angle mods are rad if done correctly, honestly most people would be better off with rack spacers and a lot of caster. You can make gobs of angle with a PROPERLY adjusted suspension
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