You have to be in the zone to fish SS darters. They have a very gentle feel to them because they dart and zig zag rather than swim. If you watch bunker in a strong current then you will understand why these plugs are killer.
My advice is cast a touch up current, dig it with one smooth faster crank, then crawl that thing til its at your feet or out of the strike some. But ill stress again that you gotta be in the zone. Slow your breath, heart rate, soften the eyes a bit and picture the plug working in the current. Youll know what I mean when you get it.