I think you should move back another 1.4 meters, or get a smaller screen to increase the sharpness.
Is This Retina? - DPI/PPI Display Calculator
Measured up here and eye to screen is about 95cm, and with it mounted to the wall behind will be about an extra 14cm minus the mount and body, so about 105cm, plus more when computer chair is changed for a sofa.
Calculates as becoming retina at 107cm distance, which seems about right.