Smtg's not right with your squats. You're loading your quads far too much. The load when ascending should be on the hips and lower back. A back squat, should NOT be a primary quad dominant exercise. It's primarily posterior chain (hip/lower back), so sit back more.

And your stance, for the deadlifts is far too wide. Lower your hip and keep the bar closer when starting. With 2-3 practice sessions, you'll be pulling 170KG, piece of cake.