|Scott,.... If I understand what you're proposing (looping T-20 or T14 back on itself 3 times and attaching it to the end of a shooting head??), I'd say that's not going to be a viable set-up and may prove to be dangerous casting. The weight of the 3 foot section of T-14 (X3) would be 128 grains by itself. But it would be a lot thicker than a straight 9 foot section of the same material. Mr. Ewels suggestion sounds good to me.|
You might just be better off attaching a short length of T-20 to a mono backing and lob/strip casting it and using a heavy fly. I'll bet the sink rate would better than what you're thinking about doing.
Have you checked out what the guys in the "Calico Syndicate" are doing to obtain depth while fishing deep?? Their line designs include using a running line of t-14 or heavier and attaching it to a very heavy tapered shooting head.
Their line weights can vary between 750 to 1,000 grains. They're catching some large Calico's at Catalina Isl.