It just takes time to get used to the cars you are driving, if you are using a DS3, I can't even comment since my coordination is trash, but on a wheel, braking/slowing and knowing your RPMs help me a lot, and each car for me is different so if I drive a car that I barely drive, it takes a few turns before I get the feel. Good luck and keep us updated with your MT evolution!
@Da Dogg, I use both, but sometimes when coming into a tight corner I seem to get a better turn radius when using one hand on the wheel and one on the shifter. Also if I need to use my E-brake (Circle button for me) I will utilize the paddles until I start to exit the turn then go back to the shifter. That is what I like about GT5 compared to Dirt 3, you can assign both areas to the same function....