If you’re using the latest version of the theme then the option to have the blog posts show up at the end is already available as an option.
The code to make it happen is much more complex than the grid loop code you added above, but the new version gives you the option to turn it on or off by checking a box. You can find that option in the Customize > Front Page Content Settings page.
Also, they’re using front-page.php now for the home page files.
With the latest version of Epik, you do have the option to add the Latest Blog posts under your Homepage Widgets (using the Customizer @eric mentioned above). Here’s what it looks like when you select that option – http://i.imgur.com/AeZ261y.png