Hi, I have recently started working on learning the Roll Like Water song from Fundamentals 1 and have been drilling the chord changes pretty fanatically for the past week. I am seeing slow progress which is fine but am worried I may be drilling with poor hand positioning and don't want to form a bad habit if I can help it.

My main concern for the moment is when I am making changes between Am to C and Am to G the upper part of my palm and the area between my thumb and index finger has quite a lot of contact with the bottom of the neck. Would this be considered poor form?

Thanks in advance.