I do not see the point with spacers between the tang and handle.
Why are they there? To fill an uneven gap, a gap there because of a bad fit steel/wood? Work on the fit.
The more glue areas, the larger risk for delamination.
Using a metal spacer is even worse, as the glue layers only try to attach to fairly smooth metal surfaces, all 3 of them on each side, plus one (each side) wood surface! A failed handle is fine in the kitchen or garage, not so fun if it happens in the forest.
I firmly believe the strongest solution is one piece of wood or other material on each side. Glued, riveted/Corbyied. Nothing between the scales and steel.