I had the same issues with mine, your tyres should be 185/60 14 and 20 psi. My car had quite a few problems, incorrectly installed rack, saggy dampers, tracking was out and awful bump steer. It's now sorted and it's like night and day. The Super sport does not really have much go till you hit 5000 rpm you can rev it up 7600. This can be improved by timing the cams in properly, this made a massive difference on mine. It helps if you are handy with a set of spanners as all the work I have done on mine would have cost £1000s in labour