This is a real tough one. I think bar heighth depends on many things. When I went out for a week or two, I had to lower the bar to ease shoulder pain. Then I remembered that all my long sleeve shirts come from tall person shops, or are 17-1/2 in. neck and 37-38 in. sleeve length. With the tall shirts the tail comes down almost to my knees. With one bike measuring system, this meant that I have a short torso and long arms. When I try to cram these arms into the space that a 34 in. arm goes, it hurts a lot. My bars are about 50/60 mm below seat height. I know there is a fit system that measures the angle of the knee to set seat height, I feel that the angle of other joints is important as well, shoulder, elbow and wrist need to be in a comfortable natural angle to work well.