armLengthMlp bendDirection bendGoal bendGoalWeight handPositionOffset IKPosition IKRotation palmToThumbAxis positionWeight rotationWeight shoulderPitchOffset shoulderRotationMode shoulderRotationWeight shoulderTwistWeight shoulderYawOffset stretchCurve swivelOffset target wristToPalmAxis

Transform target The hand target. This should not be the hand controller itself, but a child GameObject parented to it so you could adjust its position/rotation to match the orientation of the hand bone. The best practice for setup would be to move the hand controller to the avatar's hand as it it was held by the avatar, duplicate the avatar's hand bone and parent it to the hand controller. Then assign the duplicate to this slot.