The Dead, In Their Uncontrollable Power, by Karen Osborne

In The Dead, In Their Uncontrollable Power a starship is bound for Paradise, but it is no paradise itself.  Heavily socially stratified, and the captaincy is maintained by a process of abstracting all bad memories from previous captains and giving them to a child of sin, and the good memories to the new captain.  The story is told from the perspective of the sin holder.  A good entry for the Nebula for 2019.