Chumming will only bring the Channels in. Shad is the key to finding blue kitties. You can't chum for them. Most of the time, regardless of water clarity, catfish can be found near submerged timber, creek beds, and other structure. If you can't chum in advance, try looking for roosting birds. You should do well near them as well.
If you're after the catfish, give Dusty a call!
Lake Lavon/Lake Ray Hubbard
Dooleys Guide service
Tell him Ayman sent you.