Villas,
On the ground, Yaw is centered around the main wheels.
When Airborne, Yaw is centered around C of G.
C of G is forward of main wheels.
Consider moment arms from rudder to wheels (G), and Rudder to C of G (A).
The (G) Yaw moment arm is shorter than the (A) Yaw moment arm, so you would expect to need less rudder when airborne. However you need more rudder due fuselage blanking effect.