Exactly true. At contact the racquet face must be perpendicular to the floor. At most 5 degrees tilt. With an extreme grip you just need to contact the ball more up in front of you. The grips is really about that wrist snap, or wind shield wipper movement, to accelerate and brush the ball from a low to high movement to impart top-spin. But at contact the racquet is always squared with the ball. This happens automatically. Why think about it? That will only harm your game. Just focus on brushing, from low to high and making hood contact with the ball. Thats it.