Position your stick in your hands so that the blade more down towards the ice when you hit the puck.
For some reason I can put pucks up into the 10th row of seats when I shoot like that. I tweak the positioning a bit and I can lift the puck all the time.
One of the guys in my rec league loves to take slapshots. Rules are that slapshots are okay but you should at least try NOT to blow someone's ankles out. Well this guy doesn't give a crap if someone is standing right in front of it. He winds up and blasts the puck into the other guy's shinpads. Then laughs about it.
I wonder if he'll be laughing when I run his ass over.