Ok, I know, I 'm a selfish SOB that keeps "secrets" but today I feel generous and I 'm going to share one dirty trick that has helped me catch LMBs with severe case of shutmouthitis, don 't know if will work on smalljaws but you can try.
You need a soft plastic jerkbait preferably one with a long thin tail to make it more lively and attractive, instead of T rigging it like everybody does you hook it at about 1/3 of the length of the bait wacky style on the head side. Cast, let it sink give it a series of twitches and then swim it like a crankbait for a couple of feet, then twitch it again several times and swim it again. Repeat the process until you are out of the spot where the fish are cruising, then reel in fast to retrieve your bait and cast again.