My sites not down - deindexing problems

My P B N was not hit, i have up to 40 networks and none of them was affected. None of my sites dropped in ranking except one. I dropped two spot down for a keyword and probably some long tail keywords. And i didnt drop for my second primary keyword.

Hence i noticed that i mentioned that dropped keyword twice in the site title and tagline also in the title of the article, the first sentence and more in the body of the homepage article. The homepage article has over 3500 words. Few links to amazon and many outbound links and links to inner pages.

Since my pbn are not deindexed i was wondering why i dropped in ranking. But recently i built some web2.0 tiered links, not the spammy type and added some pbn weeks ago.

I dont know if i will be able to recover, i have corrected the over optimization of that particular keyword and make it look natural by removing the excessive keywords mentioned and i hope something good happens soon.

Whats your take on this?