Here are 3 ways to make your screens better:
#1. If its a delayed HB screen(meaning he pauses then runs his route) motion him out so that he's running towards his blockers.
#2. If its a non-delayed screen, put him on a drag towards his blockers.
#3. If its a non-delayed screen user control him, and and run towards the blockers. make sure you kinda run back a little while doing this, so that the Linemen doesn't play against it.