I have checked some portfolio post. And I recommend you change some layouts. For example, the work MAPROKO (http://therumbakings.com/portfolio/maproko/) could be designed without the plugin ‘Visual Composer’, better as a default layout like this one: http://www.creabox.es/demos/wp_blanco/portfolio/the-best-logo-design/
I would only use the plugin ‘Visual Composer’ if the desing is more complicated.
Regards