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Did you find 10% dead zone affecting the forward thrust? Setting a larger dead zone also means that you would have to move the lever more forward before any changes in the axis output. It is possible to adjust "neutral" point to where it's a tad lower than IDLE position, then when you apply dead zone, the dead zone is mostly "below" IDLE.

I am going to share my experiences that might help on calibrating the throttle for the A300. I have a tca throttle as well. Because iniBuilds doesn't have deadzones for the IDLE detent, in regard to this, I have set the deadzone within MSFS. Use the following sensivity setting, you shall find your throttle in IDLE position now corresponds to 50% in the throttle calibration. Then calibrate your throttle as normal in the EFB After you have done so, raise the dead zone to 4~5%. The thrust-lever will stay in IDLE even if you rest your hand on the throttle.