Leeville Fishing - What did I do wrong?

For some background: LINK

I took my maiden saltwater voyage to Leeville yesterday (Saturday). While the trip was a nice one, I didn't catch one damn fish. I'm hoping someone can tell me what went wrong.

I put in at Leeville public launch around 8am and fished until around 3pm. I took 3 rods, each rigged with a Cajun Thunder popping cork, 2ft leader, then vudu shrimp, matrix shad - copper sparkle w/ yellow tail, and chartreuse H&H cocahoe, respectively. High tide was that midnight and dropping until noon. A "strong" tide according to tides4fishing. Since the tide was dropping, I decided to try the north parts of Lake Jesse where the water from the north was draining down. While there was good water flow, I would not say it was clear. I could see the anchor line down about 1.5-2ft. I casted to around 3-5ft away from the grass. Pop-pop-reel-sit. After no luck there, I tried the north part of North Lake and worked my way back down to the West-East canal. Then, I thought maybe clearer water would be in the bigger bays, so I made my way down the canal to Bay Lizette and fished that coastline down a ways. The water didn't look any cleaner than in the lakes and by that time, the water wasn't moving (noonish).

Not one fish. What did I do wrong? I got a few small bumps on the vudu, but that was it. I felt that maybe my leader was too long and I was mostly sitting on the bottom (low tide). Is 2 ft appropriate, or should have I used about 12-18" instead. Any other advice?

That said, I saw a few boats out there. Most people appeared to also be fishing popping corks. I didn't see anyone pull in a fish, so maybe it was just bad timing?