From my experience with my MacBookPro you have to be patient when assigning the lever, it is difficult to describe it well. If necessary, it makes sense to try out different starting positions when assigning the levers.
I'm still waiting for my Virpil stick and I'm presently using the keybord as throttle control.
Even with KB control the thrust levers never move parallel. Neither when I advance the thrust levers nor when I reduce the throttle setting.
Happens on all two engined planes. This is still FS2 btw.
Unfortunately some devices seem to have this manufacturing defect, we also observe this discrepancy in the raw data at times. You can try making the calibration asymmetrical by positioning both levers differently when asked to center the positions.
How can this problem be solved when using the keyboard or a single throttle lever?
For my helicopter controller I made the fine adjustment directly in the user folder in the file gc-map.mcf (text file) and saved it in a backup. In this file, the settings can be set very individually for each input element, it's just a bit of "fumbling".
I recently purchased the Thrustmaster Airbus captain pack (I already had the sidestick and thrust levers). The second set of thrust levers has the exact same issue as my original one - Thrust lever two does not match TL1 when in the climb gate, so it looks like a fault with some of the TL's. It works fine, but I can sometimes get an asymmetric lever warning on the PFD. You get what you pay for.
I just use a single lever to map both throttles; not ideal but better than fighting with asymmetrical thrust, trying to get it even.
How can this problem be solved when using the keyboard or a single throttle lever?
Remove all throttle assignments and only assign the default throttle lever with one axis. Then both levers of the aircraft receive the exact same inputs.
