if the longnose are swimming near the top try using a rope lure. Suspend your piece of bluegill (use the head with some of the guts still in it) under a float. They like moving things to attack, they will hit lures even. You are going to have a very hard time snagging one (which is illegal) due to their armor like scales. I have caught them reeling in a worm, even stink bait just because it was moving. Last one on a worm left a tooth in my arm, respect them no matter how small.
My personal best is still swimming out there just getting bigger. One of these days I will quit feeding it.