Car slides and I'm always losing control

Hi guys, I recently bought the TX 458 (loving it) and, because of that, I switched off the last assist that I was using, I turned steering from Normal to Simulation. Happens now that, even in a small turn, I’m always causing the car to slide, and as soon as it starts to slide, I never can get the control again. I’d to have your help to understand what can I do to avoid the car to slide and, when it happens, how can regain control asap. I really want to insist playin with simulation steering and my wheel sensitivity is 330. I’d like also to keep this value because I don’t like the feeling of not having it with a high sensitivy.

Thank you in advance for your tips!