Try corn, when they are jumping a lot i find they are hard to catch. It seems before and after spawning is great but during its hard to trick them.
I will throw two cans of corn in before my first cast and i will throw a small amount on top of every subsequent cast. I ve also chummed with dog food cheese bread boilies you name it but i like corn the best.
When i hit a dry spell i changed line, used smaller hooks or weights, different baits anything to get a fish. Lastly are your hooks coming back skunked or still intact? The bullhead seem to be able to chew baits right off some days.