Then your issue is the 6.5" speaker. It uses your whole door as a "box" so to say. In short, it can not move the amount of air that your door stores. Just like a subwoofer, it works best with the proper amount of air space.....too much or too little will get you poor performance. Your best bet would be to buy some speaker baffles. This will shrink the amount of air around your speakers and give you a much fuller sound. It will also help protect your speakers from elements that get into the door.
