H-tags, titles,speed, and much more, I am very aware of the importance and using. What worries me more than being dropped on #3 is that a site, appearing from nowhere, in 6 months can get to the top. This site is in all ways inferior to mine, I mean inferior in terms of what google thinks is important. Their content is fresher of course and they have less nearly dupicate content. But it seems to me that history has no weight anymore. It seems that once you are ther for three years, you are damn dificult to be caught. Seems I am wrong.
For my understanding, analysing the results for years, sooner or later the mechanism, the algorithm behind (from Google) must become clear. Thousands of people are on top and after making an inventory of everything possible that can be important, I don't discover new things anymore. It seems that they have some secret arguments left as, as you told yourself, in many cases the logic based on what is known is far far away.
And no, their domain is as bad as mine I started my site without knowing that a keyword in a domain name is important.
What I see is that in the top 10 there are 9 .be domains and only mine is a .com. Maybe Googles starts to give importance at local domains.
And no again, I don't have many G+1, but they don't neither. I have many pages on Facebook, a page on LinkedIn, a blog with my Google identity, an author link on my site pointing to this identity .... I'm getting out of arguments !