The front leg opens up too soon and sort of just steps toward the plate. Also, your glove drops to the side. These things lead to early rotation of hips and shoulders and that shortens the stride. All of this wastes energy and causes you to throw with more arm.
Keep the front leg closed off longer, get the hips moving forward faster, and keep the glove up in front. The only thing the glove should do once it is extended out front, is to turn over and wait for the chest to move to it.