Adult males don't need that much food to keep themselves in peak condition. I often find myself feeding mine every 2-3 days versus my adult females who would be more than happy to pig out every day. Males also tend to be more timid about going after prey so smaller is often better than larger if you are unsure about the right size for the prey items. Some males can also be especially shy about going after prey when their is the commotion of a human around their enclosure so I often drop in the meal than back up and give it a half hour before removing it if uneaten.