Questioning about correct posture meditation

 

In my meditation practice I’ve found that small adjustments in the torso make a big difference on the neck tension and the pressure feeling inside the belly – certainly I remember the basic requirement of not forcing the breath.

My inquiring is linked to my observations above and directly connected with cushion’s height and weight distribution between the back and both knees in any of traditional meditation postures. 

These changes happen when these three base points range from an equal distribution for each one to an unequal distribution where the back or the knees are the preferred support to shoulder hip torso alignment

Having in mind that we want a natural posture what would be the answer to a correct meditation posture?