I use strike indicators in a similar fashoin. I put a nymph (usually a chrono but not always) at whatever depth I want to fish ( I also usually use fluoro leader because it sinks faster) I cast out, let it sit for a few minutes, and then ever so slowly inch it back in. I find I have better luck in the spring and summer though. By the way, to me this is the most boring fishing technique and I find it hard to stick to unless it is spring or early summer. I'd much rather prefer to find some structure and drag an olive carrie special close to bottom near the structure very slowly giving it a small twitch once in a while seems to work in the winter for me.