i have a few helpful pointers that really improved my drifting ability, use higher gears than normal and never floor it on a corner unless you're already at full opposite lock, even then it can be difficult to recover.
use small bursts of half throttle and be in the gear u wanna be in before you reach the start of corner.
ky national reverse is a favourite of mine and was the track i learnt on.
has great corners for drifting,
oh yeah, use reverse variants of tracks for drifting due to the arrangement of corners from fast to slow.
i hope i've helped, may you drift in style and finesse(on servers labelled as drift only )
edit: heres a replay of a few laps so you can observe how i drift...