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There are sites that Google visits way more often than that. For example, you'll see Q&A questions on Moz indexed within minutes.

Hey Doug, Thanks for your feedback! I have checked different combinations that could be keywords of a particular page and it's surprising to see right title tags for some keywords and different titles for some keywords. My websites are ranking and improving! This is happening with Home Page of one website is well: metalrecyclers-brisbane.com.au! Tricky in deed! Thanks for your reply btw Regards

You may also find this YouMoz about recovering from a penalty helpful: http://moz.com/blog/ultimate-guide-to-google-penalty-removal It'll help us if you say if you've gotten any notices in Google Webmaster Tools, if you've submitted a reconsideration request, removed any links, disavowed any links, etc.

You may not be able to change much content, but you can add content. Add a human element that discusses why product A may be better than product C. Rand also discusses something similar in today's Whiteboard Friday at http://moz.com/blog/handling-duplicate-content-across-large-numbers-of-urls.