Hello.
Thanks for the replies. In fact I'm already a PPL with almost 70 hrs... My PPL instructor never mentioned that was overcontrolling so the problem comes uncorrected from a early stage of my flight training.
Yesterday I was talking with some guys from the previsous ATPL course an they said that the instructor who told me that I was overcontrolling too much, says that to everyone who flies with him. Nevertheless it doesn't mean I don't have that problem.
I'll pay more attention in trimming the aircraft properly.
Thanks again for the help!
(and sorry about my english)