Hi I don't run the same car as you but the stotfold track is very high grip you can run really worn tyers and still have enough grip it is also a little bumpy in places but its a good track. It has a lot of off camber and hilly sections withy a wall of death
.
but just race your current set up but word of advice don't use new tyers
its not needed and you wont get round you will just grip roll??
tyers its ballistic buggy or the usual Schumacher mini spikes but I have run dboots to with great effect.
Hope this helps a little
See you at the ooose