I too have this problem, and I think it is fairly common, dealing with the pressure of racing close to other cars, I’ve been enjoying rc now for about two years and although I deal with it better now than when I started, the pressure from another car still affects the way I drive to an extent. I have found the more races you compete in the better you will become at holding your line when some one is right behind you or in front. yes practice by yourself will improve your driving skill and thus improve the way you handle the car even when other cars are on the track, but the more racing you do the better you will be in the long run. the most important thing is to keep your driving clean and to have fun. my ten cents.