Try Fern Bay Black (rev) with one of the LX cars. Unless you try to impress your friends with drifting, you will quickly learn how important throttle control is. Not only will you be almost constantly cornering through a good mix of slow, medium and fast corners, the relatively narrow track and steep curbs will also teach you precision.
Ontop of that, the length of the track makes sure that no lap is like the other, and especially at the beginning you'll have to rely more on actually controlling the car and estimating corner speeds, than falling back on a ingrained and almost automatic reaction gained by driving through that corner a thousand times already (which is often the cause for the "brick wall" you hit on PB times, because instead of trying new techniques you're always doing the old and often sub-optimal things).