I had exactly the same problem when I recently got my rudder pedals. Firstly, it does take a bit of practice but even so I found the rudder pedals to be WAY too sensitive on the ground. The smallest input would have be veering off the runway, and this is unrealistic. Firstly, I adjusted the sensitivity of the rudder pedals to -65 for left and right, but although this helped with in flight oversensitivity, it did not help me on the ground, where I still had crazy sensitivity. I tried reducing the reactivity, but this didn’t seem to help much. Then I found what I was looking for: In your specific aircrafts’ systems.cfg file you’ll find a setting for “differential_braking_scale = 0.3 ; Delta on the amount of brake when the rudder pedals deflected”. I figured this was the problem and so I reduced this from the default value of 0.5 to 0.3. Problem solved…