I diversified anchor text but still got hit by Penguin

I read many articles about diversify anchor text. (20% money keyword, the rest are long tail keywords, brand name, naked URL, click here, view, click….etc ..)
I follow that but still got hit by penguin. More details about my site.
My main keyword was about 10% ,
Long tail keyword 1: 10%
Long tail keyword 2: 5%
Long tail keyword 3: 5%
Long tail keyword 4: 5%
Long tail keyword 5: 5%
Brand name: 20% , naked URL: 20% , the rest are click here, view, click….etc ..
In my niche, the homepage has many keywords to target. All the long tail keywords above have more than 1000 searches / month. The onpage seo just target only two keyword.


I ranked all of long tail keyword above on page 1 before, but all of them were disappear.
I don’t know exactly the reason why. Is it good anchor diversity ?


But I find out the problem by myself, just want to post this article to make sure what I’m thinking is correct.


Everybody said that we have to control 20% “money keyword”, It means “20% money keyword” is not only the "main keyword" but also include all of the long tail keyword that have search.
So , the proper anchor diversity is:
20% : main keyword + all long tail keyword
80%: brand name, naked URL, click here, view…etc…..

What do you think about percentage above ? I’m building the new sites, just make sure to do not get hit again. I hope experts help me on this problem.