Thank you for the details.
1.) Are you sure you want that effect? If you do that, the menu will move because the normal and the bold menu items has different widths and heights.
2.) If you want the nav menu below the slider, you will have to deactivate the Slider Below Masthead and enable the Slider Above Masthead instead. To know more about how the sliders were integrated, please check this out:
Hope this helps. Please let us know how it goes.