I ground the end of the spring as it's sharp edge was picking up on the aluminium. I ground a lead-in chamfer on the spring and added some copperslip to the ally casting.

Karls said:

I ground the end of the spring as it's sharp edge was picking up on the aluminium. I ground a lead-in chamfer on the spring and added some copperslip to the ally casting.

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That's exactly the issue I've got. Grinding the spring removes the paint which allows rust so that's the issue I had BUT it's what I'll have to do!

Just found this thread and realised I hadn't added a conclusion. Well the damper has been on for more than a couple of months and it's helped the stability I would say. The pan hard rod bushes were done at the same time so I can't be sure they haven't changed things as well but they were worn when I still had the original tyres and no issues. All in all it's doing its job and handling the larger tyres so I'm happy with it.