I don't know if this is a common technique used for fishing senkos - or even worms - but it's been brilliant for me, and I began doing it out of frustration!
Alright, so a few days ago I was out at the river getting skunked. I had tried everything: spinners, cranks, worms rigged in every which way, senkos, poppers, etc. I went back to a senko as my last bait before I called it a day, and once again, nothing. On my last cast I let my senko fall to the bottom. No strike. I wiggled the senko after a few seconds. Nothing. I engaged the reel, let the senko sit again, wiggled it after a second. Nothing. I said screw it and out of frustration began to reel at a steady, moderate pace to get my line out of the water to go home. Just to screw around I began to lift the senko a considerable distance, while never breaking the surface nor my reeling-in. I would then let it fall a bit, lift it, let it fall -- think a heart monitor, up and down while reeling in, but long steady sweeps up and down. I got a strike... A nice smallie. I threw my senko back out, no strike, but instead of screwing around on the bottom again I began the long and steady sweeps up and down as I brought the senko back to me. I got strike after strike at all depths doing this. I ended the day with 9 bass after being skunked for the majority of the day.
The next day I went to the lake and immediately began this technique again to see if it would actually be something that would consistently work. I got quite a few strikes off the cast and sink, but when I didn't, I began the up and down sweeps and got a tons of strikes. After a bit I went to a Berkley Power Worm with a 1/8 oz weight and did the same thing. If nothing off the cast, up and down sweeps -- even worked with this bait. I ended the day with 23 fish.
Today I was back at the river fishing senkos and power worms and caught 16 more. A total of 48 fish in 3 days with up and down sweeps and slow to moderate and steady retrieve.
Heck, I might look like a fool because every knows this technique or something, but I never see it or hear mention of it. I see talk of side to side sweeps, hops and skips, wiggling, but never long up and down sweeps. Sometimes I would go from the bottom and lift all the way to about a foot below the surface, let it fall back down, and repeat... Some of my best strikes came that way.