Hi Fabio,
I use that list that you found and it is really pretty good. I use that as a check list. The challenge is that the information presented there can and will change at any time, I think the SE's do that on purpose really.
In addition your position is in my opinion is influenced by the other sites you are competing with that the items on the list. What I did was use the list to evaluate the other sites I was competing with to see what they were doing that worked.
And of course what others say here in forum say is that if the visitors do not "convert" the way you want there is no point in being #1. The challenge seems to be balancing "the list", looking at other sites AND writing good copy.
Oh of course usability ranks high as well.

as one of the admins here reminded me in a report I purchased.
The problem for us newbies is juggling all four of those items, and that I think is where the pro's can do better. I do ok, but not great
In other words if the balance is not right, you and I will focus on rankings, then when that does not return the results we need to stay in business, we will change the site some and the conversions start but the rankings may slip. Then then the volume of business goes down
Are we having fun yet?