I never use a snap swivel to connect my line directly to the bait. Snags on grass easy, inhibits the baits movements, and stands out too much for my taste. I would stay away from the boat ramp if there is allot of traffic coming in and out of the lake. Try different spots that you can reach, maybe a point or better a point that has a creek channel near it, if you have a map of the lakes bottom. If you get there on a slow day, sometimes at a boat launch there will be a wash out in the bottom were boats come in and out. Try crawling a worm or craw type bait over the bottom real slow and see if you get bit!