If I'm fishing a jig I toss it, let it hit bottom and bump once, then sink, bump, sink, bump, sink, waiting about 3-4 secs in between bumps, and doing this all the way back to the boat.
This take a lot of time but it covers more area per cast and will let you know what's going on on the bottom a little better.
After 2-3 casts I troll a little farther, and do the same. If I'm going to use a jig I anticipate a long trip out.
Also be sure the "bumps" are quick hard rips with the rod, not very long but fast.