ForumsInternet/eCommerce

Dont do much changes very frequently...optimize Title of page once in for all and maintain healthy keyword density pharase "message in a bottle" and also dom some internal linking within your site from the same keyword and if prob still there, acquire backlinks from similar site as yours.

Have you tried SEM, it might help to jump start that particular keyword, at least for the pages you want it too?
Also, have you considered other means of SEOing? except for optimizing your site?
I usually suggest the creation of personal pages in and out of your website to promote your personal business presence on the web.
You could try registering to LinkedIn ( www.linkedin.com ), besides increasing your business leads you would be linking (with whatever keywords you'd like) to your business site. Another option is Twitter ( www.twitter.com ) which basically does the same thing, only with a bit more time investment (not that a full LinkedIn registration is that short). Another useful service is LookupPage ( www.lookuppage.com ). It allows for a much more professional look for your profile and its decidedly less time consuming, so I'd start with that 1

The best of luck

Jmes
http://www.lookuppage.com/users/jamesbrass
brassjmes@gmail.com