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Lets say that  a prior writer did a horrible job with more then a few pages on your site and you wanted to rewrite the content for each landing page. A few of these landing pages are actually ranking pretty decently would it be ok to rewrite them as long as you kept the keywords and the density some what equal?

I currently have a service based website with landing pages for surrounding towns. For example the keywords targeting and url for the town are "service+town+state". I recently noticed that I am not showing up at all for "service+zip" even though I have the zips included in all the landing pages. I was told if I made more landing pages dedicated to zip I would risk killing the rank on other landing pages.

Would it be advisable to make another totally different website that focuses on just the "service+zip" landing pages. The name of the page would be the same the company obviously but the phone numbers and content would be different along with domain url.

Any advice or suggestions are welcome. Thanks.