I understand why you would want a loop to loop connection, but I don't understand why you only attach a 6-8 inch section to your line. Why not your full butt section of 30-36 inches and then your loop. That way, you'd never have to worry about it going through the guides once you've rigged your rod and it would still be far enough away from your fly that I don't believe it would scare fish. Besides, I suspect all your various leaders use the same or nearly the same butt section anyway.