Hi usearchme,
1) Forget keyword density. It's a pointless measure in isolation. There is no 'right ratio'.
2) Forget trying to get your pages crawled more often. More frequent crawling ensures that the information about your site (your content) is up to date, but if your content changes frequently naturally, your page will get crawled more frequently anyway.
To summarise the above, just write good content for your users 
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