Hey Mitchell
Take half second between inhaling for the Valsalva and starting the rep. Don't let yourself get mushed into the bottom by the weight. You're letting yourself get a little loose as you hit depth, which causes everything to slide forward. Keep reaching back with your ass to get the hamstrings stretched out as you point your nipples at the ground.
You're also trying to lift your chest as you drive the hips out of the hole. I suspect that may be causing you to crank the elbows up as you ascend and pissing them off. Get your eyes down 3 feet in front of you and keep them locked there. Keep your chest pointed at the ground as you initiate the hip drive out of the bottom.