If I had to choose between the proper depth and an exact imitation, I'd choose depth over pattern every time. If fish are feeding on chironomids, and the fact is 80% of the time they are, then the challenge is not just catching them, but catching a LOT of them. If the hatch is on and the conditions are right, its tough to beat the numbers you can post if you know how to fish chrionomids. And I don't care what anyone says, its always more fun to catch more fish than fewer fish. There is a lot to figure out to fish midges successfully, depth being the most critical. And there's a lot more to it than just fishing under an indicator. That is just one method. Dry line short greased leader, dry line with an indicator, dry line with a long leader and no indicator; multiple flies, larvae vs. pupa, emerger vs. pupa, hi-D wet line, camo line, multiple fly, wind drift, dead drift, slow retrieve, no retrieve. And the takes can vary from a slight twitch of an indicator to a full blown explosion on either a wet or dry line. And yes, you have to pay attention. In Canada you can fish two rods from one boat. If you want some chaos, try to land two 5 lb. Kamloops at the same time and not spill your beer! I grant you, when fish are not eating chironomids, it can test your patience. But then, any time they aren't biting anything, its not near as much fun.