simple. u're not making physics work for you. think about it,
why don't u see Formula 1 cars drifting? unless you have a very
loose surface, or a very very sharp corner, usually, even WRC cars
tend to minimise drifting. the only time when drifting helps u
corner faster is on entry, and even then, only very slight
oversteer. the slight oversteer is to help orientate the car for
the exit as early as possible, hence an early accel as much as
possible, at a speed higher than possible. the driver would have to
catch the oversteer even before it has really started because that
little bit is all it takes to orientate your car properly. once its
orientated, anymore sliding or drifting would be a waste of power
and time, instead, once the oversteer has been caught, start accel
smoothly out of the corner.