Qt - LP is ~110'" at the deepest pt. During the winter, back in the day with my mentor Big Jim, we use to fish the inlet, 65'. We nose hooked nightcrawlers on jigalos and caught big CNBGs off the bottom and on the drop. Killed way too many fish. Now - I fish mostly for suspended fish no deeper than 35 FOW.

Chris - don't think my 1/48th or 1/32nd jigs get deeper than 12' @.8mph and the 1/24th jigs might be getting to 15' at that speed using 2lb test line. I'm using 2 lines - one has a slightly larger diameter. I watch the depth finder for baitfish & bugs. If a hatch is starting - go real slow, as they rise you start speeding up and fish the higher column.
"How do you troll with these light jigs" - troll speed is between .6mph and 1mph, mostly .8mph
"Are you running some weight on your line also" - No, but a friend of mine does and it's been discussed.
"Are you running the bait near the bottom in this 17-28 foot depths" - Depends on what's going on with the food chain.