I'd look at your tyres before messing about with the car setup to much, Silverstone is too bumpy to comprimise the setup too much to deal with grip roll. I've found that if you use yellow minispikes at Stotfold when they start to get too worn and go off they are then about ideal for Silverstone, even the stagger ribs on my 2wd have done a couple of runs at moto arena to take the edge off them.
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