Display issues

Hi,
I’m using the following CSS to evenly space elements in the navigation:

@include desktop {
    #{$wrap} #{$menu} > li.mega-menu-item {
        width: 12.5%; /** 100 / (num_top_level_items) **/
        text-align: center;
    }
}

However, I notice that the links with longer labels appear to be spaced closer together. I need each link to be spaced equally. Can this be achived?

Also, only one of my links does not have the drop-down arrow next to it even though it has sub-menus.

Is there somewhere I can send the URL privately?

Thanks.