What are recommended filters for using Pagespeed along with Drupal 7 (and Advagg enabled)?
Every site is different. I recommend extensive testing. http://www.webpagetest.org/ is one of the better sites for testing the frontend and seeing what options are best for you're site. Be sure to test more than just the frontpage &amp; look at the connection view; using the bundler you can adjust this a little bit, try a bundle of 1 or even 10. Point is you'll need to experiment to get the best results. The modifier has lots of things you can do to tweak things; deferring the js is one of the better options in my opinion.

I've heard that google pagespeed has a +-20% difference; it works better or worse depending on various factors. Give it a try and be sure to test!

Work on inline css is being done btw: https://www.drupal.org/project/css_delivery