Hey James
The bar is too high on your back, so you won't lean over and/or it's going to feel like it's rolling up. The elbow pain is likely from you trying to manage the bar rolling around.
Widen up your grip and when you get under the bar, start high and slide your back against the bar until you feel it "catch" under the spine of the scaps. Then walk the hands closer to your shoulders if you can.
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