Ok so a little update for today. I slight loosed off the screw under the front bogie of the drive car which aloud a little more movement. Im still getting the same problem at the 85-90% power setting. Its ad if the power car is rolling outwards as its starting to turn into the corner and momentum carries it over and off the track. Like a lorry speeding round a corner and topling over. I tried then to add more weight lower down inaide the body on the chassis but this didnt help. I could add more but i dont see the point in adding loads and loads of weight