.... watch the sonar. For Blackmouth, I keep my ball one to two feet off the bottom at all times. I run at a depth of choice by feel.

Lower the ball slowly as you get close to the bottom. When the ball hits, give it a few seconds and slowly lower the ball again.. The blowback should keep you in the "sweet area" with a 48" release at 3 feet above the ball. When the ball hits the second time, read the sonar depth and troll along this contour.
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"If you are not scratchin bottom, you ain't fishing deep enough!" -DR

Puget Sound Anglers, Gig Harbor Chapter