Aux 2 needs to be +100/-100 if you are using the 'gyro sensitivity' function, then aux 2 output is controlled by the gyro values you have set on the Gyro Sensitivity screen. like you currently have it set in rudder dual rate position 0 (switch to back of TX) you have a gyro gain of 45% (90% of 50) and in position 1 you have 37.5% and in the SAME flight mode (HH or Norm depending on the channel direction)

kc

EDIT: goto the servo monitor page and flip the rudder dual rate switch and watch Aux 2s output, you'll see here what i said above.

you want something more like this:

Aux 2 trav adj
100%+
100%-

Gyro Sensitivity (active and on Dual Rate Rudder)
Gyro Sen
0=10 (this is 80% gain in HH mode)
1=90 (this is 80% gain in Norm mode)

you can then use these values to adjust gain in the disired mode. you can also change the dual rate rudder option ON THIS FUNCTION to automatic and then your given the option to have the TX automaticaly select which gain setting/mode you want in any of the flight modes (norm/Stunt1/Stunt2/Hold/etc....)