I think sometimes aftermarket companies assume that the toe bushings are installed CENTERED on the trailing arm. It is entirely possible that the factory position is not 100% centered leading to the aftermarket toe bushings to be just out of the adjustment range. If that is not the case, I would check alignment with another shop and see if they can add some toe-in for rear stability.
Another thing you can try to physically change the geometry in the rear, and if you haven't done so, is to use adjustable camber arms to push the bottom of the king-pin out. Go up to -2.5º of camber in the rear may add enough toe-in.
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