If you are fishing chironomids imitatively then you will be fishing them static. If you are fishing static then you need to be careful about your leader setup. I would suggest that you want your flies to be as far away as possible from the main leader as possible. The best way to achieve this is to use a fairly long dropper but tie it in backwards so the dropper is facing the fly line. When it is in the water it will curve over but will be forced away from the main leader and make the line less visible to the fish.

Chris