Raced this evening and the car was great. 8.5t was plenty. Felt no reason to change any of what I mentioned above but had to keep an eye on ride height and camber. Had it between 20 and 22mm.
It all came down to tyres by the final as the dew settled and I managed a 2nd in the B with 3rd and 4th only a couple if feet behind me. Good fun.