Are you saying you want your menu to look more like this? – http://i.imgur.com/ykZib07.png
If so, I reduced the padding and added more to the left to even it out –
.genesis-nav-menu a {
font-weight: 400;
padding: 15px 10px 5px 20px;
}
The responsive menu icon was added in version 1.4. Here is a tutorial on how to do it if you don’t want to scan the theme files – http://bit.ly/Ob2bQ7