when we fished east of kellies trolling worm harness with 3oz sinker almost always caught fish at 50 lead.That would put you about 24ft deep.Good area to always have some lures is 2/3 of the way down in any depth you fish.That would put you 26.5 ft down in 40fow with that 2/3 rule.On the east side of Kellies is a large reef that is shaped like a peninsula heading east and comes out pretty far.Follow the contour lines of that reef.My buddy ran over the shallow water without me knowing and snagged all four lines we were running on that reef!