From my limited experience I'd agree with the comments made with respect to throttle
I thought I had the same problem with the asse of my Durango when I kept loosing it out of bends
Then i did a four hr endurance race indoors on a very slippy track - you simply had to be gentle on throttle or u end up facing the other way !
From that race I learnt throttle control - no more loose asse end Durango!
Just my opinion but set up dosnt seem anywhere Nr as important as driving - give a top driver a poorly set up car they will still be fast
Slow is fast - it's the future I've tasted it