The best, or most effective, way to get a fly down to the stones isn't the most pleasant to cast. I think Rob is correct. I seem to reach the bottom and hang up the most often when fishing a floating line, 10' 8# test level leader, and a conehead fly. It has minimal drag and sinks like lead shot. A Spey rod makes casting these flies far more practicable than a single hand rod. My favorite way to fish deep is with a 15' sink tip (type 3, 6, or 8) and an unweighted fly. I used 15' of SA high speed Hi-D and unweighted flies from its debut in 1977 until just lately when other alternatives have become available. I've never used T-14, and at 14 gr/ft I think I'll continue to avoid it unless I find a situation where it's the best adapted alternative.