Being grazed by any punch shouldnt bring you off balance. That sounds like a footwork or stance problem.

Anyway, imo the left hook is the best punch in boxing besides the jab maybe. I have a nice left hook and I thank the lord for it everyday. I wouldnt even think about trading it for a better right.

A left hook is much easier to land than a right. (Orthodox stance of course)

The number one way to defend against a left hook is to keep your right hand up bottom line. Other wise your gonna get tagged and like someone else mentioned it hurts much worse if it doesnt hit your hand.

Even when you block punches your still gonna know you get hit, thats just the way it goes. Your gonna have to get used to it if you want to box lol.

Left hook counters.... Block then throw your own left hook. Duck then throw a straight right.