PR:
1) More hip reach forward.
2) Also might want to start with head tilted up/back a bit or bar closer to front edge of chin so it's easier for the bar to clear your head and go *back* to your shoulders.
DL:
1) Keep your gaze on the spot on the floor the entire time.
2) Try and slow your back squeeze down a bit. Think of waving the squeeze from the top of your back to the bottom.