You can't run a trailer on crankbaits in MS unless you remove the front treble. Only two hooks per pole. Sounds crazy when crankbaits have 6 hooks on two trebles.
Try speeding up or slowing down. Sometimes they just don't commit fully. Also, different style cranks or colors maybe the key. Why it's always good to have multiple type baits and also experimenting on speed. You can learn alot in your turns!