Dear Vchum,
Yes, You can do that. The Render Blocking CSS caused by one of your Plugin Table Press.
Please use W3 Super cache plugin for optimization. W3 super cache and Autoptimize are enough for your site. Other Plugins may be overkill for you site. This is my opinion.
You can also give Mega Column Titles, see my other Demo Menu in your Appearance > menus
Thank you.