Thrustmaster Warthog Throttle inaccurate operation

I have the throttle set up in MSFS, when I check the range etc I have full smooth operation from closed to full, however in game from full throttle if I start creeping the throttle back the RPM drops from full to about 2000 then either creeps back up of drops to 1500, not smooth at all, If i pull the throttle back at 1500 it can rise to 2000 plus then drop straight down, there is no smooth 1500 1400 1300 etc, more like 1500 1800 2100 1500 1100. I am a licenced aircraft engineer by trade and run these things day in day out, and no piston engine aicraft have I ever seen operate like this, I am talking the 152. 172 as none turbo and also the jets like the G-91 etc

Using the Warthog Throttle here, I would double check your control bindings, the only time I see what you’re describing is if I have more than one axis bound to the Throttle in error.