I use everything from 2 to 4 in. baits it just depends on what size hook is on the jig.         

4" chigger craw for me, sometimes I take a segment or two off the body,but I like a nice slow fall

5 in Yum Dinger.  Turn it sideways and hook it through the middle, yup, wacky.  On the fall the head and tail of the worm vibrate back and forth and look a lot like crayfish claws fully extended.  I haven't fished it much but the strikes I have had on it are massive 4 ft line jumpers or some thunder thumps.

When the waters warm I like a full skirt and big trailer but cold water I trim my skirt and keep the trailer shorter. And with colder water less action seems to be better. I've been using a flappin hog as a trailer lately and have had crushing bites. Jig is my main bait and small things get the bites. Changing skirt size and trailer size is a key. I generally have 3-4 rods rigged with different jig and trailer combinations. Rotate them and see what they want that day