In my opinion, the more simple the rig, the more effective (with the right materials). I use the ESP Sinklink, with the Kamasan B175 Fly Hook (size 6/8) tied straight to a korda ring swivel. no tubing, rings, loops, mini swivels, etc. im not saying that other rigs dont work, but i feel that the most simple rig u can get away with, the better.
however, im a firm believer that if you are successfully catching on something, then STICK TO IT!