Right form to do a Woodchopper?

I always feel like I am doing something wrong when I do the Woodchopper move.

Should the 'chopping down' motion be controlled or swinging it down letting gravity aid you?

Should we turn each feet for the upward and downward motion?

The major focus of form should be the shoulders and torso twist, right?

Any clarity on the right form would be really helpful. Thanks! Kavya