WordPress SEO plugin (problems with archive subpages)

I got dinged a couple months ago by Google Panda or at least that is what I am assuming since my blog dropped off the first page of Google and into the abyss.

I have been trying everything to improve my rankings but nothing is working. One thing I haven’t been able to figure out is how to deindex my archive subpages. That would be page 2-50+ of my category pages. (I do not want to deindex category pages)

I use WordPress SEO by Yoast and I have checked the box to deindex subpages of archives but Google doesn’t seem to care. I removed a bunch of URLs but of course the more I write, the more pages are created, and Google indexes them. I am worried about the duplicate content issue which I know is a big part of Google Panda.

Should I uninstall WordPress SEO and re-install? I don’t really know code but I need these subpages to be noindexed by Google!

Thanks!