Achieve better back tightness and torso bracing. Many different kind of cues can work: Chris likes pulling the bar into your back. Ur thinking about elbows which I reckon is not an effective cue. Elbows up down side ways whatever does not a tight back make.
A tight back is about active tension in the muscles of your upper back and shoulders. Personally I don’t really cue anything specific but try to set my back deliberately during the set up and maintain shoulder blades retracted and depressed throughout
Don’t think about elbows. Think about setting up your back and let your elbows go where they will depending upon your flexibility and relative body proportions.
Check out the vids in this post I made:
And these
