In single.php when it calls focuz_post_format() found in extras.php, if a featured image is used for the post thumbnail it forces the script to output the image size ‘blog-thumb’, this image outputs at 360x240px but is then resized up to 748x494px in my case. Can this thumbnail size be removed so that it loads the original sized image to render and resize down, rather than resizing the lower quality thumbnail up?