The crush tubes should be about 1mm wider than the bushes either side. This is crucial as otherwise the bush will be clamped rather than the tube, this will stress the nrbrackets and not allow the wishbones to move freely. The bush should be free to rotate around the tube. I had the same problem when I built my car, I took a belt sander to the bushes to remove the desired amount of material. Bit of a pain in the ass job but a must.
HTH Dan
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