are you using the strip metadata option?
I am actually having this same exact problem and I tried the remove meta solution already. Feeling a bit cookoo.
http://www.huckfinnjubilee.com
Are you looking at the mobile results, or the desktop results?
See this thread related to the mobile recommendations: http://wordpress.org/support/topic/pagespeed-insights-saying-the-photos-can-be-reduced-by-90-or-more?replies=4
I saw it at both tabs. Would you mind checking url?
The last couple images are theme images you can take care of with the Scan & Optimize function. The rest are because your images are not resized properly for the theme you are using. The solution varies widely depending on the theme, but here are a few that might work:
1. Find out what size the theme is displaying the images (it looks like 615×615 to me), set the medium size in WordPress to that, and then regenerate all the resizes with something like the Regenerate Thumbnails plugin.
2. There are plugins that let you add custom resizes, so instead of using the Medium size, you can create a custom one at 615×615.
3. sometimes themes have a mechanism for resizing images, or you can register a particular size option within the theme.
