I use 10% deadzone, and -50% on all my axis sensitivity for my TCA Sidestick.
There is a weird issue with the rudder twist, though. If I leave my sidestick alone for a while, over time it gets really jumpy whenever I make slight movements on the sidestick in any direction.
Usually the only way to solve this is to actually shake the sidestick and do a full twist movement on either side. It becomes stable afterward, until it doesn’t anymore after a few hours.