If you assign two analog axes to "Cyclic forward", inputs from an axis are reduced to its half;
pushing the in-game cyclic to its maximum range needs inputs from both of the axes at the same time.
The more you assign axis, the less an axis effects:
assigning three analog axes to "Cyclic forward" limits inputs from an axis to 1/3,
assigning four analog axes to "Cyclic forward" limits inputs from an axis to 1/4.
Any other analog actions ("Car Left/Right (Analog)", "Bank left/right", "Thrust/Brake (Analogue)", etc)
are also affected by number of assigned axes in the same way.
This behavior prevents using different controllers to operate each vehicle in the same category
(e.g. HOTAS to helicopters/Pad1 to quadcopters/Pad2 to parachutes) without remap control options.