Plastic versions of pork chunks are a popular choice due to convenience in storing them. The same effect as a plastic chunk can be achieved by trimming the tips of a double tail grub so they are straight rather than curly. You can see examples of how to trim them in the attached photo. Sometimes fish want this straight-legged trailer especially during winter, early spring or late fall when water temperatures make fish feel lethargic. In cold water, they prefer their meals to look as lethargic as the bass feels.
Color is an important issue.
First, there is the skirt color. Jig weight is important too. Regardless of depth, you need to be contacting some sort of cover with a jig. Don't fear losing it, that's why it has the fiberguard. Learn to jig.