New guidelines for content

As a direct consequence of the huge decrease in traffic that I've suffered after the Google "roll back" the 22th of July, I've reconsidered guidelines for content on my websites.
One of the most important factors is the length of the content. Untill now I've considered 200 words per article to be enough, but now I believe it should be a bit longer. About 300 - 350 words.
Another important thing is Google's improved spell check, which means that a webside will be considered less relevant if it contains mis-spells.

Therefore lately I've worked hard to write longer articles and eleminate mis-spells on my sites. Hopefully this will help to get rankings back.