Well 3 weeks in a row now. this time its slightly worse. As far as I can tell my form is fine. when im leaning back to start off, my neck should be in line iwht my body right? Or am I supposed to keep looking straight ahead regardless of starting back angle. I can't think of anything else. Its on the left side just below my head. My last warmup before the 5 rep max is at 40kg, but that still 66%. Maybe ill try 2 reps at 50kg. 66% should be fine though damnit.