Hows your back when you squat? I would suggest trying to strengthen your erectors, as it will definetly help and as improves overall body strength. Also what i did was become more robotic at meaning instead of just bending over keep you core tight and kinda squat it out. It's tedious but will help and elevate the constant strain.
Also
sparks2012 and
MistrJay try to lean forward a bit with the upright rows you will be able to feel it in you delts(rear) and also traps. rather then any acitvation in your back. but lock your self in ie keep your core tight. If doing it withe a straight bar hand position is crucial as once you start your movement your stuck with it. Using db's is easier and safer IMO.
All to their own on their thoughts on this excersice ROM is a big factor as too many go way to high. I never do them with a rope it feels weird more of a joint movement depending on how you hold the rope. Everyone has strong points and weak points as everyones body has different leverages and structure. if trying variations on a movement and pain still progresses stop and evaluate exactly what the issues which takes time.