Trying to make sitting on a bike more like sitting in a chair results in failure every time it's tried, it just puts more pressure on the butt and back, less pressure on the hands, and closes up the chest. It's counter-intuitive, but stretching out the back with a longer lower stem opens up the chest, gets weight distribution on front and rear wheels more even, increases hand pressure, and takes the pressure off the discs in your lower back so they can elongate a bit and stop compressing with every pedal stroke.
Any position change that puts more weight on the rear wheel is bad news all-around, especially for the back, or at least that's been my experience. Going down the road of curing back pain by sitting more and more upright, which requires bigger and softer seats never really seems to succeed, unless the goal is some temporary comfort on very short rides. Diamond frames are designed to perform best and be most comfortable when the weight distribution is not 95% on the rear wheel.
Last edited by Lemond1985; 04-28-19 at 05:48 AM.