To become faster in each corner it is important to know where you are fast, slow and maybe offbounds.
To know if you are consistent because riding the same ideal line each round or just luck to get the same lap time in; record your laps and examine them in the replay. Check if you are using the entire track, maybe you could use another one or two extra meters on the surface before turning into the corner.
By doing this you will become a faster driver.