To clarify, if you raise the pulley to the hight of, or closer to, your wrist, you’ll be adjusting the tension to be greater at the beginning of the lift; meaning the hardest part if the lift will be at the beginning of the concentric, and end of the eccentric (the start and finish of the motions). Adjusting the pulley to approximately the height of your shoulder and raising from that point overhead would cause the tension to increase greater and greater as you reach full flexion (hand raised overhead - a very difficult lift, as it begins with an already shortened [contracted] deltoid, and progresses into full flexion [the shortest, most contracted, therefore, weakest contractile portion of any muscle]. Adjust your weight accordingly. And keep in mind, delts don’t need massive amounts of weight to see results. Err on the side of a bit more volume than heavier load.