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If it is true bumpsteer/toe change you are fighting, Baer makes a bump steer kit that replaces the outer tie rods with rod ends and adjustable spacers.
I've seen these on LGM's world challenge cars, so that should be a good source.
You may just have worn tie rod ends or wheel bearings, or both. They all feel similar, wandering, bump steer. They seem to go out very early if the car is used hard.