@Guigiaro 90% of your review is misleading, as most of what you have said it's not true.
Only 20% of the domains were coming from .info domains....Google updates page rank, and sometimes some blogs lose their PR...yes that happens, welcome to the world of SEO. We always replace the domains that lose PR. Judging by the small number of posts you have, and the quality of your site, I assume you are a beginner.
As for serp movements, you website (a cheap ONE PAGE SITE), has gone from nowhere to first page for some of its keywords.