Splake are nomadic, meaning they move a lot
After the sun comes up, the bite will generally slack off (like all trout)
Keep moving, using a camera will help find fish if the water is clear enough.
I wouldn't worry about the size of your bait. If they want it, they'll get it.
Try some Rosie Reds, It's a little different and may be the "magic" bait for a day.
Wiener