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I was recommending embedding copy in an image so it doesn't get crawled and rankings aren't affected by any changes in content.

I would look for another .com.br domain, since that will give search engines a natural propensity to rank your site better in your country.  You can target this in Webmaster Tools, but with Bing they don't offer that, you have to rely on them properly Geolocating your IP.

I would hypothesize that .info domains are clicked through less due to spam issues, and as a side effect have lower positioning in the grand scheme of things.  I say this because of the revelation that Google and Bing both utilize clickstream data to some degree.

Also, .info or .biz just doesn't look good for a brand.  Unless it's built around that TLD like bit.ly or delicio.us

I'm pretty sure that changing content can have an affect on your rankings, especially if you reduce the amount of content* by half.  You could forfeit a lot of long tail searches because of words you aren't even targeting just by having so much content.

If it were me, I'd run a test on just one of the pages and monitor conversions.  Don't run it on one of your key money pages though, but one that gets sufficient traffic to make the test worth while.

Another thing to try is to put the sales copy in an image on top of the text.