I took the hammock back out today and tried again. I cannot voluntarily move my biggest quad (vastus lateralis) while getting out - it seems to have something to do with the pressure on the side of my leg. I can't move it in a crouched position at all - though it is 'learning' to move with the other muscles in the area during my workouts now. I may be able to train it to move when getting out over time.
It lean over and step out move is impossible for me.