Jules,
Congrats on your first post.
Regarding leaders, as you've recognized, there are many different terminal systems getting around. Which system you use depends on yourself and your chosen lure presentation. Understanding the stresses placed on a leader will allow you to determine which to chose for which application.
Some of the stress a leader faces include the abrasive mouth of the barra, impoundment structure including sunken tress etc and line tension, which I think is the most important.
To combat the abrasiveness of a barra's mouth or impoundment structure you need to select a hard wearing, high abrasion monofilament or copolymer line. Flouro Carbon is also quite abrasive resistant but IMHO it's knotability is low and it sinks which can be undesirable in applications.
With line tension, I beleive it is the most important of all the above stresses. As you know, when tension is placed on monofilament line the line stretches, when the line stretches the diameter of monofilament reduces meaning the ability of the monofilament leader to withstand abrasive contact also greatly diminishes.
Understanding the relationship between line tension and abrasive resistance will help you decide the best leader for certain situations. ie in the bay or flats with no structure, I'd be comfortable using single 80lb and feathering the drag on the spool using minimal tension as determined. In the tight structure, I'd go for a twisted setup with the drag fully locked to steer the fish clear of obstacles.
I'm a big believer in "the harder you fight a fish, the harder the fish fights" but finding a balance between the right amount of tension to save the tackle and to land the fish in a timely manner is unfortunately up to the anglers experience!
A couple of important things that I believe can't be overlooked before you head out onto the water -
I don't fish Awoonga much but I'm sure the other guys can help you with specifics but, the standard barra lures will work if you put them in the right place!
- Don't compromise the lure presentation for the leader. It's no good having a bullet proof leader if the lure action is ill.
- Knots - Tie them with the material you chose to fish with and test them before you head out onto the water. Different braids and Mono's have different knotability and what may have worked for one combination may not work for others.
- Make sure your line is tight on the spool
- Have fun!
All the best,
Matt C