how to best override inline height and line-height on top nav menu links

I have been asked to customize the header of a site based on Enfold and place some content above the top navigation menu. I see that the menu is laid out vertically using inline style declarations to set the height and line-height to a specific value for each menu item, and I need to reduce this to allow for space above the menu. Is there a hook for these menu items that I can use to adjust these inline style values to reduce the height of the nav items? I’ve looked at the nav_menu_link_attributes filter, but this doesn’t seem to be getting run for the top menu (although I am seeing it being run in the footer menu).