I have a snap swivel tied to the end of my 50lb braid , to this I clip an 8oz lead via about a foot of 30lb amnesia and a swivel , the shad is tied directly to about 3ft of 40lb amnesia and this is also clipped to the same snap swivel on the end of my braid so when I lift the whole lot up with the rod the shad hangs about 2ft below the lead. Slowly lower the whole lot into the water and the shad will seperate from the lead with the tide movement , you will be able to see the action of the shad now as well

( I ditched a new pack of shads last trip out because they had as much action as a nun in a brothel)
Now you let the whole lot go down to the bottom , let the lead bump the bottom and close the reel , the shad being lighter will still be 3-4ft from the bottom , lift the lead gently off the bottom and s l o w l y wind 5 or 6 turns of the reel then thumb it back down , repeat as many times as you can during the drift , varying the speed of retrieve , often the fish will hit the shad hard and there is no mistaking it's a take , just as often the fish will nip at the shad 2 or 3 times before it actually takes the lure ..... DONT STRIKE! , just keep winding at the same speed till the line tightens.
If there's a fairly fast drift , you can forgo the winding up and down and just hop the shad along the bottom , same as before but once the lead hits bottom just lift it slowly the height of the rod and lower it back down till you feel the lead bump bottom again.
Ray