You are getting the right idea for downwind. It is almost like going wild downwind on the A, constantly working the main in conjunction with your steeting. Working the main is to help keep the drive forward in the kite and being able to work deeper and keep the apparant forward. Keeping the main cleated the whole time means you raise the windward hull too much and lose the ability to drive lower faster.

Have to stay forward on the moth as you need to keep your weight over the foils. Back too much means you increase the Angle of Attack and the bow lifts too much and the whole thing ventilates and decides to dive underwater quicker than a submarine. Lot more to think about for sure, but that was the fourth weekend sailing it, so getting better for sure.