Remember: Always step on the ball. If the ball is out to the right, it means you need to step on right rudder. In other words, you need to loosen up on the left rudder.
If you have too much left rudder selected, the aircrafts nose is too far left for the (left) turn you're trying to achieve. You're skidding out of the turn. Just like a car, in a turn, where the front wheels have lost grip.
Works for me.