Be sure to have shift lock on while doing a curve shot! If you don't, aiming will be hard, and you may just kick the ball to the side. Are your shots just not curving, no matter what you do?

Using a shift-lock on PC is one of the ways to maneuver your ODM gear easily. In this game, pressing shift will activate the sprint action. So, in order to use the shift-lock, press the CTRL key.