Your technique is more important than the weight. You might want to check if you don’t get a lot of skinstretching. There was a time I hung 10+ Kg and I later estimated about half of that tension was on the skin. After tightening the hanger more and reducing skinstretch to a minimum 6-7Kg felt heavier than the 10+ Kg I used before.
Bend over is similar to hanging SO, but sitting in a chair using a pulley is a lot more comfortable.