Thank you Adobe.
Tip: For walk cycles, make sure to select “Walk in place” in the sliders area.
Pace is independent of curve length. Uses only a single keyframe at frame #1 for Y position of helper arrow plane.
Draw Bezier Curve starting in world origin.
Draw helper arrow plane in world origin with object (local) origin set to 3D cursor (= world origin).
Set a keyframe for frame #1 for Ypos.
Graph Editor > [N] > Generator > -0.065 (dependent on walk cycle anim)
Add a Curve modifier to helper arrow plane object (-Y axis, BezierCurve).
Parent the Armature object to the vertices of the arrow plane (Edit Mode).
Edit the Curve object > [A] > Mean Tilt: 180deg. This will flip the object.
Camera constraint linked to Armature > Hip bone
‘track to’ camera linked to empty vertex parented to arrow helper plane . Watch the red/green XY axes.
No more bounce. Bit unfortunate placement of empty, but am trying to match previous example and keep feet in the shot (honestly).