What your looking for is an even transference of power from the line to the leader, so what you need to do is match the leader butt to the line tip.
Take your line tip and bend it over. Now match that flexibility with your leader material
That's your starting point.
Then find a leader formula that matches the diameter starting point.
Leaders are as easy or as complicated as you want to make them
All part of the game
The simpler the outfit, the more skill it takes to manage it, and the more pleasure one gets in his achievements.
--- Horace Kephart