One of the reasons I like to set the BB at .680 when fishing 150'-170' is because the reading at that depth is more around the .600 mark at the ball. If fishing is slow, I'll turn on pulse mode which will jump me up to .720-.740.
So it may appear that I run a hotter than normal wire, but in all actuality, I'm not.

Downriggin'
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"If you are not scratchin bottom, you ain't fishing deep enough!" -DR

Puget Sound Anglers, Gig Harbor Chapter