Character Movement Not Consistent Along Spline (Blueprint)

Would like to see a video showing your issue.

As for your actor: How is your hierarchy organized? I see you are moving the actor and camera along the spline?

Judging from your reference, I would approach it like this: Move actor along spline, move ship component with input within a magnitud in local translation on the ZY plane. For example:

Camera as component of the actor moves with it (not along the spline), but not a child of the ship with a “soft” look at. This way you’ll only need one tick event and 1 actor along the spline (each level can be 1 spline entirely from start to finish). Everything handled within one blueprint.