You mention metal Tuna jigs, but the traditional Japanese knife jigs are even more deadly in certain applications. Namely metering concentric "gettin' worked" balls in the lower water column. You need to instantly drop a Butterfly jig and get down to business. The hydrodynamics of the Knife jig speed drops faster than the descent rate of a Yo-Yo style iron. There are many types of metal jigs out there for many different species and applications.
I make my own jigs out of handles of solid tableware butter knives.
Salvey shopping for 5¢ butterflys with a little custom work..
http://www.bigwatersedge.com/bwevb/s...favorite+irons
You can catch a 200# Thresher on twenty pound test of you want, but properly arming yourself with at least a 120 yard topshot of 65# green spectra you will soon find standard on most guys set ups around town targeting Pelagics close to the kelp..