Much is made about the thermocline for obvious reasons. It is usually right below where the fish stack up. It is not a static thing. It is different depths, depending on what part of the lake, how much rain, if the dam pulling water, night temps, day temps and so on. Generally, if they are pulling fish at 55 feet suspended in 110 feet, then the thermocline is just below 55 somewhere. Of course....I could be wrong.
I fished without any electronics at all the first few years and we used to count down our line and fish up from there until we started getting hits. It has to be a real challenge without electronics, especially if you have fished with them.
If I remember right....weren't you looking for walleye the last time you were down? The only reason I ask is there are fewer walleye fisherman on the forum than bass and crappie. Sometimes the info is a little thinner in that area. Either way....you are part of the old boys club now my brothjer!