Hi
We've been using the same set up for both GT and Bluefin tuna with almost 0 failure,
it might sound a bit complicated but it is not,
5 to 6 feet of 130lb Jerry brown that has loop at both end,
first loop will be attached to the main braided line with improved albright knot,
second loop will be attached to your twisted leader (150LB) as loop to loop,
at the end of the twisted leader your choice of shock leader (300lb)
you lay down the twisted leader next to the shock leader and you form figure 8 knot (that knot will stay out of the rod tip while casting)
last you tie clinch knot to the solid ring and a 300lb of split ring of your choice,
now you are ready to battle,
Tight lines
Sami