How to define the character/player collision box/cuboid?

I have a custom character model (who will have animations at a later date)
I visualise the cuboid with a Box.
I add the CuboidCollider inside Ecctrl.
The player finds the floor very bouncy and flies into the sky.

<Ecctrl debug ref={ecctrlRef} autoBalance={false} animated position={pos} jumpVel={0}>
    {/* <EcctrlAnimation characterURL={characterURL} animationSet={animationSet}> */}
    <CuboidCollider args={[1,2.15,1]} mass={0} position={[0,0.5,0]}/>
    <Box args={[1,2.15,1]} position={[0,0.5,0]} />
    <BaseMale scale={0.8} position={[0,-0.9,0]}/>
    {/* </EcctrlAnimation> */}
  </Ecctrl>

Reproduce the bouncing-floor behavior using the Ecctrl and CuboidCollider setup shown in the issue, then inspect the controller's collision handling and collider placement. Done means identifying the correct collision-box configuration for the custom character and confirming that the player no longer launches upward.