Dubbin is tough to get a mirror shine, apply a layer of neutral polish on top when they are totally dry and they'll buff real shiny. That's unless you have access to pure carnauba and a means of applying it (tough without a motorised polishing wheel).
Giro Republic LX soaked in clean water then dubbin'd whilst wet then slow dried and buffed up and finished with a fine lady's nylon stocking. Honest.