Who are you competing against for those important keywords? Take a look at their sites. What helps them to achieve the top rankings? What are they doing to make the search engine think that their site is more relevant to that particular key phrase than your site is?
Right click on their site and look at their source code. This will give you valuable insight into their meta data and content, and can help you gain a better understanding of what you will need to include to help you achieve those top positions.
If you want to know more about Redweb Search, please drop an email to search@redweb.com or give us a call on 01202 779944.