I suggest to try 15% of expo first (+ on JR and - others) on your plane and increase it step by step until 25% or 30% everywhere until you get comfortable with your plane. It's definitely will give you better feeling. Don't bother with dual rates now. You will be comfortable with your plane at the recommended (by manual) rates and 25-30% expo. Don't be afraid. If you can fly your plane now you will fly it better with some expo.