We let the club lever and extend into the ball. This is something that happens naturally, so don't try to force it. Forcing positions create unpredictability in our swing. Here's how to avoid it.
Adding your hands more to your swing does not cause the club to fall behind. In addition to getting the club in the right arc, it also generally makes your body work better, too.
If your hips are coming towards the ball, try steering your force into your right heel. If you anchor into your toes, your hips tend to come forward.
If you want maximum downward force in your swing, you want your Lats to extend. Throwing a medicine ball hard down into the ground works the hip flexors and Lats. Make a backswing so your arms go up. Your Lats can extend and then come down and contract to create more speed.