1) I think a slightly wider grip will be better.
2) Lock out your arms all the way against the uprights before bringing the bar over your face to your shoulders.
3) Take your breath entirely before you start each rep.
4) Try and keep your elbows slightly in front of the bar. Think of leading with the elbows forward (not to the sides) as you start the descent of each rep.
5) Try not to rock your head up and down during the lift - keep it locked into position.