So many options...
It comes down to conditions. As with any type of fishing.
Your doing the right thing with poppers at dawn and dusk. But Mid-day smalllies can be tough to get a bead on.
One thing that has helped me is determining what they would be feeding on during the day. Basically, are they looking up or down for their food?
A smallie favorite is crayfish. Tubes, hair jigs, and crankbaits, mimic crawfish pretty well. These are a smallie fishermans staples. Try to match the color of the crawdads. Of course, target the rocky structure that would hold these bottom dwelling critters.
In the Reservoirs I fish, smallies are feeding on Sawbellies. These silver baitfish travel in schools and you'll find smallies schooled up under them. Jigging spoons, cranks, rat-l-traps in silver/black or silver/blue then work.
Smallies are weird fish, and 've caught them on wierd things. Pink spinnerbaits, Clear crankbaits, even muskie sized inline spinners.
Then you could also cheat and use a live minnow under a float.