If you have not had a lot of success slabbing then sometimes it's a matter of learning what a bite feels like.
Because they bite differently day to day, month to month, season to season, and sometimes hour by hour.
I find that the hardest fish to catch for those with not a lot of success slabbing under their belt are the fish that; bump the slab up in the water, fish that just barely tick the slab, and those that only hit when the the slab is barely lifted from the bottom.
I watch the rod tip and line of customers who are just learning to jig, or those who have not had a lot of luck doing it.
Then I coach them to hit when the line suddenly goes slack, or I see that little tick in the line that means a white bass just hit it.
I tell them to hit anything that feels different, a slight "tick" that they feel, a little more pressure/weight on the line, a little less pressure/weight, slack in the line when the slab should be dropping, etc...
Here is a group of folks and their catch(100 white bass and two hybrids) who went with me on 7-31, John, Suzanne, Victoria, and Abigail.
They hired me to help teach them some spots and methods for slabbing white bass.
They are good at trolling and catch plenty of fish that way, but they wanted to up their game with some slabbing.
The first stop we made the fish were small, but very aggressive and they caught enough to get a good range of experience with the feel of how they bite.
When we found the pay dirt they could knock the daylights out of them no matter how they hit.
The white bass on Lake Livingston typically bite like hard heads in the surf from mid April to about the middle of June.
Then the big schools break up into smaller ones that tend to rove a lot. And they start to hit the slab with a lighter touch and require more sensitivity to feel the bite.
Often the first or middle of June is when the thermocline sets in. And the fish suspend at 15' anywhere they find shad in open water, or move to shallow water above the thermocline near the bank.
The Dennis Christain in-line spinner method works really well during this time of the season. You can also catch them on slabs when you can find structure above the thermocline.
Holding a slab dead stick style where you see them suspended at the thermocline in open water on the sonar screen and hitting them when they barely touch the slab is very tricky, but after some practice is effective.
Going out with a guide in your area this time of year will give you some advanced slabbing skills, as they are tircky right now when they are not schooling on top.
Sometimes the this time of year the fish feed on tiny newly hatched shad, and smaller slabs work best, 3/4 oz to 1/2 oz slabs are what I use, and I like DuckTracker slabs in The Reaper style. You can find them on Facebook.