Hi,
The minimize request size is a generic advice, basically it’s telling to don’t have a huge content inside each page with large images etc.
Regarding the (Remove query strings from static resources), that is done on purpose to don’t cache those css resources or it would be more problematic to see any css change on an theme/plugin update.
https://www.dropbox.com/s/h9i1sn0k63xiy8z/Screenshot%202016-05-06%2011.28.50.png?dl=0
The resources here belong to a couple plugins and also from a css of the theme, they aren’t significant.
Your performance score is very good atm.
https://www.dropbox.com/s/ixw4kq5qwkiepvn/Screenshot%202016-05-06%2011.32.08.png?dl=0
-Rui