amazon affillates question

Hello,
At the moment i got 320 articles scraped with wpzonbuilder on my site. All descriptions and reviews are from
Amazon.
Now to get a better ranking, i should have unique content.
Now my questions:
Should i rewrite all my articles new or only 5-7 articles?
What is the easiest way to make it unique?

Thx
Hackbird

For my amazon sites I only use unique content. you can write them yourself, but I just buy my articles. I have found that it is not worth my time to write them when I can get 500 word articles for about $4

You don't need that many reviews... if you have one long and well written review of three or four products in the same category, you have a site ready to go.