thank you for your reply!

What I've noticed is that I usually play chords with my thumb quite high on the back of the neck (the thumb can easily touch the 6th string) but with the Gadd4 I have to low the thumb quite a lot and twist my wrist a lot.

In the Lisa's video (https://www.guitartricks.com/lesson.php?input=24767&s_id=2043) you can see that she also twist her wrist in order to play the Gadd4 and also the shape of the pinky and index fingers seem not really natural (the pinky is compressed and the index is bended).

So I wonder if I have to change the position of my thumb between one chord and the other (as in the video) or I should find a position that works for both.

thanks!

Ale