Locating crappies at night......they should be in the same areas during the day as well with the bite fading into dark ,but an hour later pick back up again.
I'd drill holes up and down the break line and go back to mark after sdrilling those holes.
Drilling can spook them.
So drill a bunch of holes then go back to read them with your flasher.
The may slide up shallower ,say 15 FOW to look for forage.
Patterning any lake takes time as does a puzzle.Once you put the pieces together it's payday time.Ka-Ching!
Once you do find them work the water column lifting those fish with small baits.Under 64th oz down to 100th oz.
I'm not a meat user ,but you may be.
A marmuska tipped with a waxie or a few spikes will trigger a finesse bite.
I like hair or fur jigs without meat keeping my profile thin and small.
