I find I catch more fish if I don't fish slow, also in cold water fish tend to stack up, so once you find them, you can catch a few. Once they won't hit a spinnerbait and crankbait consistently, I'll switch to lipless, finesse jig, chatter, jerk, and blade in that order. I'm sure you could dig a hole in the ice and catch them with a blade. I find a swift but short jerk works best, most bites occur as the lure stops, or begins to flutter down.