I have done well for cats with floats, drifting live chubs through deeper runs in the river near my house. I was using 3" - 4" wild chubs, using a 5" "big fish slider" slipfloat made by thill. I was running the chubs about 1 - 2 feet off the bottom, anchoring the rig with a 1/4 oz slip shot.
I have also used the 5" slider with chunk bait, and it worked well for that also.