Normally when we run a "bump plate" it refers to an additional solid or heavy screened plate with the same image the heavy ink areas in the art in order to get more ink on the sheet for increased density or vibrancy. This is helpful for PMS colors or for heavy solid colors. This also helps if the stock has a lot of trash in it to cover hickies.
By your description, I count 4 units for 4 / cp, 1 unit for PMS, 1 unit for additional PMS bump, 1 unit for spot varnish, and 1 unit for metallic ink for a total of 8 units needed.
I would prefer to run the metallic ink last but it is normally laid down first. Ensure that the traps are adequate to keep crisp borders. Metallic inks should print in knocked out areas and not overprinted.
Overprinting metallic inks with coating or varnish will diminish the metallic effects and can cause them to change color.