lots of questions...take your time, some days you can do no wrong, and some days you do no right...I fish each hole I cut whether I am marking fish or not, especially in clear water. fish can be hanging just off the side of your cone, and you won't see them. also, try different jigging presentations until you find something that works, some times it's fast, sometimes it's slow....I start at a new hole fast, trying to get the active fish, then gradually slow down to entice the inactive fish to bite...I also try at least a few colors and jigs....as far as depth goes, every body of water is different, seldom have I caught numbers of craps over deeper water then thirty or so feet, but seldom do I fish over more then thirty feet...like I said take your time...fish each hole as it were your first, think that big slab is there, and sooner or later he will be...