I would say that drift is off. Or it could be that your dry is not big enough or buoyant enough to support your dropper. I try to have my dropper a couple of hook sizes smaller that my dry. For example I will drop a nymph no larger than a 16 off a 12 dry fly. You have to also consider the water you are fishing. If the you are fishing pockets or riffles you need something like a Stimulator or Wulff or a hopper. On calmer water you can get by with a comparadun or a parachute. Good luck. Hope this helps.