Ok, Ive done about 1000 miles since I started driving in my mini. Ive been a bit silly too!
Ive done the odd reverse 180, The odd wheelspin, and Handbrake turns. I also have had the tyres screaching around bends etc.
no mate, you tracking is out, have a look at the state of you track rod ends and a look at the general state of you blal joints and all the suspension bits. you best to go to you local tyre monkey and ask him to get it tracked up, but put the poper wheel on first bannana!
good to here about these fast corners etc... and that might be taking the tread of, if its on the out side of the tyre the i would say it is the incredible corner speed you seem to be carrying

because the car wants to go straight on and the rubber will move on the wheel and fold under slightly, and teh skreeching i would say is the outer part of you tyre wearing away