I was taught the " Stevenson Jiggle " by my
neighbor, Rick. (his brother,Mark caught Ethel,
If you don't know who Ethel was , Ask someone who
bass fishes.

)
Pick the slab off the bottom and give the
rod tip a couple of quick shakes, If you don't
get bit, lay it back on the bottom and repeat.
This works almost all the time. Espcially good
in cold weather.
Early in the fall, I find they want to chase
a bait, Will cast the slab, let it go to bottom,
Burn it for 3-5 cranks and let it fall back to
the bottom. Repeat. Many times you can feel them suck it up off the bottom.
good luck
MO