I decided to move the menu above the widget footer area for space and aesthetics. Unfortunately, I ran into the issue when switching the placement in footer.php. (See Code)
[code]
I tried working with the CSS, because adjusting widths resolved a similar issue to with the sidebar. This time my efforts were to no avail. (See Image)
I ended up removing the Nav altogether and creating a widget menu. Though I would love to know the fix for the future, so I will leave this open a little while longer.