Troll as slow as you can. Do a little research and you will find past dates and conditions of the Cabellas walleye tournament that uses South Bass as the host sight. It is usually in the middle of April and some years has been cancelled due to weather. They target large females trolling large crankbaits ( JSR#5 and #7 and down deep husky jerks) often blue/silver or blue orange in color, moving @ .8- 1.2 mph......Good luck