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I think that "keyword to the left" has become one of those SEO myths that just lives on and no one tests it.
So now comes the next factor. I wonder if you have some keywords to the right titles you can compare. My sense of it is that you may be seeing a keyword-in-the-middle correlation mostly because that's where your keywords happen to show up.
Regardless of whether it appears to be a myth or not, I still wouldn't recommend people stuffing their company name and motto/slogan on the left of every page.
Then again, are we talking about Google, Bing, Ask or some other SE?
Has that kind of URL consistently lost ranking for you recently?
Have any of you noticed this as well?
Make your website a work of art...
invest in high quality imagery, become an expert in your niche...
engage in social networking...
and forget these title tag theories.