DL - the bar is ending up forward of mid foot at the bottom when you reset in between reps(which is causing your hips to drop too low) so you need to roll it back further, to mid foot. Only breathe at the bottom. Think about pushing the floor away with your feet rather than pulling on the bar with your arms. A 3in belt would help.
SQ - Narrow your stance so your heels are shoulder width. Hold your elbows lower. Slow the reps down a little