Rich, did you try flexing the chassis 'rails' by hand, before and after the brace was installed? It's quite alarming how easily they can be displaced by hand!
It's good to see you're taking on the task of resolving some of the fundemental issues with the car. Are you going to put up a shopping list of parts, so others car sort the rear bump steer?
Theoretically, as the Marlin new rear upright uses identical ball joints, connected to a common top arm, the bump steer should be sorted.
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