The post was somehow “derailed” in some unexpected directions. Nobody intends to spoil seat back adjustment to squeeze a few km more from the rear tire. I had the feeling that my body goes too far back on the saddle, like I need the saddle to be reset a little back.
Then I wondered whether the faster wearing rate of the back tire can be a sign that my position is already too far back. Finally, I set the saddle back with around 1.3 cm.