Carolina and splitshot rigs both work. An unpegged Texas rig allows the weight to slide up the line and separate from the tube at times, enhancing the tube's erratic action. Peg the eye of the hook inside the tube with a piece of toothpick. This keeps the hook eye from popping out from inside the nose of the Tora tube. The correct weight to use with a Tora is not much different than with any other bait.
Some guys slip big spinnerbait trailer hooks over the primary hook to snare short strikers.
Of course, this is for open water. You can go much heavier in tough cover. The best conditions are whenever fish are turned on and feeding. Often during the morning and the evening in clear water. Tora tubes can work all day in clear water if it is cloudy, rainy or with a wind-smeared surface.