what was that weight ghosty?
the main thing to look for is keeping humerus parallel to the floor through the mov't - using ghostys vid (obviously it was heavy so form wont be perfect) you can see when he starts to struggle his elbows start dropping
if you are struggling to hold the bar as mentioned stretch lats mainly, although extending the wrist helped me out aswell. you don't need to be holding the bar in a full grip, you can release your pinky and thumb and just keep the bar stable with 3 fingers.
Always keep the bar off your collar bone as much as possible