Originally Posted by Determinism
Maybe you're going too light on the exercises you don't feel.
Also, the back is hard muscle group to focus on. Some guys have the same with chest. When you're using correct form, and try to focus on the elbows moving the weight instead of your hands, then I'm sure your back muscles are depleted.
Most of my sets was at failure so I don't now, on leg press for example I wasn't at failure (to hard) but sensation was horrible, maybe I have higher resistant to pain on upper body
And yes my form was correct, like usually, I'v doing the movement with lats elevating shoulders and then depress scapula on the way down) and traps (initiate the movement with shoulders), I think I'm doing all rights, my back is not a weak body part