Jeez...Thanks for the mention, but I recommend you read my previous post instead because I wrote that page over 12 months ago when we knew alot less than we know now about the supplemental index.
Duplicate content is usually not the answer, especially if a site's IBLs are weak. Get links from trusted/authority sites or at least from a page that's in the main index. High TBPR link trade / paid links will help somewhat but not as much as an organic link that carries full link weight as well as signals of trust.
I have two sites, one is a TBPR 4 with 100% organic links and another TBPR 4 with 99.9% artificial. The site with organic links are close to fully indexed while the other one the link profile is so mistrusted the PR is discounted and many pages are refusing to stick.
Even with good IBLs pointing at your site, if you have thousands of pages you are going to thin out the inbound PageRank and some deep pages will go supplemental. In that case you cut off link juice from unimportant pages and redirect it to pages you want to rank. I know, Adam Lasnik recently said in an interview PageRank flow is not overly important but he's contradicting what Matt Cutts previously said about combatting supplemental results in an effort to discourage people from nofollowing every internal/outbound link:
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PageRank is a much larger factor. So without knowing your site, I’d look at trying to make sure that your site is using your PageRank well. A tree structure with a certain fanout at each level is usually a good way of doing it.
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As I said a TBPR 4 will have a struggle supporting 17,800 pages especially if your IBLs are obviously artificial.
I mean.. look at this:
www. manhattanservice.com - ManhattanService -
Website promotion and search engine optimization
And this:
http:// everynote.intissite.com/
Spammy footer links: "italian kitchen", "spain sim-card", "mattress"....
I don't have time to go through all your links but the one's I see look pretty lame.