First, the fish are here. The fish are at least semi-active simply by taking the time and energy to follow the lure back to the shore before veering slowly off. This is a common occurence on sandpits throughout the midwest. You have more options at your disposal now than you realize. By going smaller, say to a smaller sized Rapala, you can probably entice these fish.
Tubes are an option also, slowly twitched just beneath the surface.
I have seen that simply changing to smaller sized presentations are often just the key a person needs to taking cold front affected fish. GO SLOW -I have had a few experiences where just by presenting my offering at a much slower pace helped immensely. You can expect fish to hold much closer to the bottom and to any available structure after the passage of a cold front. Normally, depending on the severity of the front, I would switch to a jig and minnow and probe the bottom structure. If there is visible structure available, then a quick swith to tube baits, plastic jerk baits or small grubs will do the trick if fish are present.