So, it’s linear, does that mean you’re using the A32NX Custom FBW version? If so, you might need to adjust the throttleconfig.ini file. Make sure you have these values, or at least closer to these values.
[Throttle]
Log = true
Enabled = true
ReverseOnAxis = true
ReverseIdle = true
DetentDeadZone = 2.5
DetentReverseIdle = -0.90
DetentReverseFull = -1.00
DetentIdle = -0.42
DetentClimb = 0.06
DetentFlexMct = 0.53
DetentTakeOffGoAround = 1.00