I was using a 15lb braid main line with 8lb Seaguar Tatsu leader. Like WRB said above, it all comes down to diameter. The 8lb Tatsu has a diameter of .009, while a few other leading brands 6lb test is larger at .010. Take a look at the diameters sometime, it's pretty shocking how different they are. I use a 25ft-30ft fluoro leader to keep the braid from floating too high and impacting the bait's action. I'm planning on trying it with straight 6lb fluoro as well to see how it performs.
I found that a 7' ML is about perfect for this technique and you can cast it very, very far when you have a rod that light matched with braid. The bait itself is a little rocket, even in the wind. I use a Shimano Sustain reel but really any reel with a good drag will suffice. With that line and chance at big fish, the drag is crucial.
I'm still learning it and have only used it one trip, so I'm sure I will learn the intricacies more each time out.