If you wanted to center single post page and you failed you can just download the theme here:
https://docs.google.com/file/d/0B4OZAogVG6miU1VFNzdTd3p6M2c/edit?usp=sharing
I already centered post and featured image
Can you please explain what you had done for centering the single post pages??
I am going to try this shared folders and i write here my review…