When I use hoochies I like to go short, two times the flasher length. For spoons, I like three times the flasher length.

All of my measurements depend on trolling speed. If you troll slow you need short leaders. If you troll fast longer leaders are better.

How deep, I think depends on where you are fishing. I don't like to fish in more than 100' of water for migrating kings. Fishing down 80' in 90' of water has been my lucky number at Redondo.

I am sure everyone will have their own measurements.
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Carl C.