[Handymansd]

What:
I like to use very large greenbacks with a 7/0 mutu circle and 150# mono leader works well for T's up to 100#s or so. Larger Sharks typically need steel. I have caught them with steel leaders but I seem to have more success with mono for number of bites... go figure.
Fishing with Rapalas and other "Tkillers" is really a questionable practice resulting in mostly tail hookups, not much fun, and I choose to not participate in using them.
While using chum may increases your chances, it may also increase your chances of being targeted by larger model Mako or other denizen of the ocean depths better left alone... or to more stable fishing platforms like a boat with experienced captain.

Where:
I usually have better luck fishing the temp and current breaks as opposed to any certain depths, especially in a yak where the up-dwelling banks are kind of hard to get to. In particular try the lines of debarkation just outside of areas of "dirty" water or low current water. If current and temp breaks are difficult to find the next best bet is to try to target the higher edge of the canyons or where large drop-offs occur. Most Threshers are usually hooked in 100' or better, though smaller juvenile models are typically caught in shallower waters; but as with any fish they can be caught at any depth. The larger models tend to like the bait presentation lower than 30' in my experience, not in the surface column. Just be prepared and be safe when targeting larger sharks even T's can be dangerous at <100#!


Just my 0.02.
Good Luck!