You could try recalibrating the throttle itself. Though that would affect all games I assume.
The instructions are on the Logitech support FAQ page
https://support.logi.com/hc/en-au/articles/360025175874--FAQ-X56-Space-Flight-H-O-T-A-S-
under recalibrate Axis firmware.
There are some other calibration layers you can proceed through in the FAQ