Orphan hubs means that they are not grouped. Grouped hubs can increase views as often these hubs are linked together either by textual links or links at the close of your hub. Are 3 or more of your orphan hubs on the same overall topic? If so, you can assign those hubs to a specific group. I think it helps with your profile overall to have groups of topical hubs. I just checked your profile, you can assign your hubs to Travel and Places, as one group.