The ergonomic design for the human body is flawed.  The padding for the lower back protrudes too far forward and the headrest fails in most reclined settings to be too far rearward.  The excess drop in the mid-reclined position (about 60% rearward) when the footrest is not fully vertical creates an excessive force on the lower back that precludes desired comfort.  A redesign is in order by a competent Industrial Engineering third year student at a competent engineering school.