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thanks man,  all your advises have been very helpful

Hi Miguel. How recently did you make the switch?  The reason being, it takes Google some time to crawl all the changes, index, and then finally pass along old authority.  Here's an older Q&A that speaks to this: http://moz.com/community/q/how-long-for-authority-to-transfer-form-an-old-page-to-a-new-page-via-a-301-redirect-moz-pa-score-update. Especially Dr. Pete's answer of... It can vary quite a bit. The page has to be recrawled/recached, which can take anywhere from hours to weeks, depending on how much authority the page has. That's usually the big delay. After that, Google may on occasion delay passing authority, but we don't have proof of that (there are just cases where it seems like they do). If it's just a handful of pages, re-fetch them through Google Webmaster Tools. It never hurts to kick the crawlers. Hopefully this helps you out.  Changing things back early on might cause even more delays, so it's better to stick with the change if it hasn't been very long at all.