the FR's have a fairly loose rear end as well. Mine felt a bit loose when taking fast corners, without chucking the car into the corner. The rear end would a bit twitchy. you'll really have to change part of the suspension set-up to correct this. I've got mine lowered on
coilover and thicker ARBs (front and rear) and it now corners high speed corners without a twitch.
Probably the best starting point is thicker ARBs. not that expensive too.