I need 4 columns on home page

I love this theme, but I’m having some trouble getting a 4 column layout on the home page. See http://www.paleofoodcooking.com.
I have made modifications as follows:
1. Created a Child theme
2. Copied and modified template-portfolio.php to include the slider and “boxes sidebar” and blog posts.
3. Created a page (set to be my home page) and chose the “Portfolio” template. It is working as it should (except only 3 columns)
4. In theme options under layout, I selected 4 content columns. I also picked the “content sidebar layout so I can have the sidebar on all other pages.
5. I still only get 3 columns on my home page. As an experiment I chose the Portfolio 4 columns template from my page edit. It then displays 3 narrower columns with lots of space to the right in what appears to be a 4th blank column.
6. I also tried choosing the “full width” layout from theme options > layout (to eliminate possibility of sidebar preventing it) and it still remains 3 columns.
7. I also found “portfolio” in the functions.php file and changed the column number from 3 to 4 without success.

I’ve been spending much time and any help would be greatly appreciated.

Thanks.