Cow's getting bigger
I started instructing using your method but eventually had more success with having the student close the throttle before the flare. We want to have the aircraft touch down with a nose up attitude. The easiest way IMO to do this is to start the flare at the right speed in the power off condition which will result in a short hold off followed by a firm nose high touchdown. The longer the aircraft spends in the flare the more chance the stude is going to screw things up. I have also found that in the early stages the student is fully engaged managing the pitch attitude in the flare and to ask him/her to simulataneously manage a smooth power reduction is asking too much.