Center Nav Hover Color?

I centered the text in my nav bar (finally!), but when I hover over the text/buttons, the hover color box is off to the right. How can I get the hover color “box” centered with the appropriate text? http://test.worryfreeclaims.com
Thank you in advance!

[don’t add new topics for old problems – http://ww.wp.xz.cn/support/topic/nav-menu-hover-color-problem?replies=1 – continue with that topic, and add more details there if necessary]