Your setups are fine. The IMX will cover just about any DS situation you can fish. Do you have a spare spool with the Sedona? You can just put 6lb. on 1 spool and then put something more like 10lb. on the other. If you have 6 on the Shaky special, you can use that for light stuff, like 6 lb with smaller baits and light weights. Like Rob said, nose hook for more action and open water, and T-rig for a weedless or shallow approach. Hooks are up to you; I prefer the Owner Mosquito and Gammies for my DS. But what matters the most is technique(?). How are you fishing a DS?
Try hopping the bait and swimming it along the bottom. Try shaking the bait on a slack line, try deadsticking the bait with no movement. Try fishing the rig vertically below the boat in open water. Bottom line... try anything you think might work. If shaking isn't working, try the deadstick, etc. Fish the DS every way possible.