Doing tests and changing I discovered or at least it looks to me that the quality depends on the clicks one get.
I got on top when I did a new campaign and had a good percentage for clics and impressions, also I noted that the price goes down when the ad rices in position.
What I noticied that if I had for exampel cars london as keyword I did not get many clicks, they were expensive and did not check many pages, so I did a new campaing with words more precise like buy car london wich raised the add and lowered the price.
However at the end of day, looks like google wanted to fill up to reach the daily budget so I got clics like buy motorbikes london wich of coruse was not interested in cars.
So I found to add a + before the words, however looks I get few clics that way, maybe its not the time of the day yet.
Yes ever is never for me, sorry