XRAY - Model racing cars

Just bought a 2018 xb2 carpet edition. I finished the build and noticed that when turning the left rear tire the right rear arm and tire raise up if I try to turn the right rear it still wants to raise up. If I hold both arms flat I have no issues. I’ve installed 2mm shims in the shocks. The axles does not look bent. I be been told by other Xray owners they have the same issue. Do I need to add more than 2mm shims to fix this? Thanks for any reply’s in advance

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