You can fish a jerkbait like a crankbait, or a crankbait like a jerkbait. They're pretty much the same thing. I mean, there are differences, and obviously a jerkbait usually works better fished like a jerkbait, and vice versa. But you're not limited to just the label of the bait. I've often had good luck fishing a crankbait just like a jerkbait that constantly bumps into the bottom. Just reel it fast to get it down to the bottom, then pause, jerk, pause jerk... Or if you're doing a steady retrieve, try to pause for a split second anytime it hits something. Or just do random pauses if it's not hitting anything. Bass love erratic behavior, especially combined with smooth, predictable behavior.
Also, while bumping crankbaits against things is often a good technique, it's not the only technique and isn't often the best technique with them. What crankbaits excel at is holding a steady depth. So if you're getting bit with a jerkbait that suspends, let's say at 8 feet below the water, then a crankbait that runs at 8 feet might be a good option too. Or maybe even one that runs a bit shallower, since bass like to feed up more than down.
And then there's the action of the wobble. This time of year when the water is warm, I like fat, rounded crankbaits with a wide wobble. Though, I never really fish for smallmouth, so they could be different.
My point being, just experiment with different stuff until you find something that works. Don't get trapped into the mindset that something has to be done a certain way because someone else said so. Crankbait fishing is all about experimenting with speed, depth, wobble, profile, location, and color to find what the bass are interested in. And since crankbaits can be fished fairly fast, allowing you to cover a lot of water, you can run a bunch of experiments without wasting too much time.