Which rock have you have you been living under your club should have kept you informed and there has been plenty of discussion on this board as well as fishing dot net. If you have genuinely missed all the info I apologise .
I will try to explain but this should be in the rules on the NZACA site.
Shock leaders must be .65 at the release point up to 125gm
.75 for 150 , 175', 200gm
The reason for these sizes is for safety and its UKSF.
For the regional casting and the Nationals TACKLE TACTICS is sponcering the casting weights and they will all be the same.You will be able to choose which weight you wish to cast with the corresponding leader line combo.
You keep saying it could be simpler , well let us in on the secret or get with the program.
GO TO THE NZACA SITE AND READ THE RULES WITHOUT PREDUDICE .