First off...make sure your car is built as per the manual. The number of times I have seen diffs built wrongly, sticky suspension arms...different length camber links and positions etc...the car needs to be free and setup correctly on the bench before hitting the track.
I would also check that you are getting full lock both ways from the servo, and that your servo has some resistance when trying to turn against it by hand ( only do this gently, and for very short periods of time, as you can damage your servo) when the car is switched on and working.
Also make sure your servo saver is tight/built as per the instructions....not loose. What condition are your tyres? Are the inserts the same front and back? You might find schumacher minipins are more responsive than your minispikes.
I use Paul Bradby's setup nearly everywhere now, and just change rear weight, and front roll bars depending on grip levels, amount of steering you want and how bumpy it is. Keeping your car working well, and making sure your on the right tyres helps the most!!!
