I'd say most of the weight is supported by the "shelf" that is created by puling your shoulder blades together. From what I understand, it seems that you have your wrists set up incorrectly before unracking. It is essential for you to get everything right beforehand. Your pinky does not necessarily have to be on the ring, its just a general guide as to where you should grip initially BEFORE getting under the bar. After pulling your shoulder blades together, lift your elbows up, readjust your grip/ wrist positioning,now unrack.