To back up RW, I throw weightless senko's all the time but the Fat Ika's are king right now.
Anytime I go out I have my Stradic 2500, with 20lb PowerPro, and my Watermelon w/ Black & Gold Fat Ika. The Junebug color seems to be doing really nice right now and last night I caught three over 2.5lb on the Black Small Red Flake Ika.
The best way that I have found to fish these are by casting it, letting it sink (be careful here as I get a full 1/3 of my bites on the initial fall). Once at the bottom I hold my rod tip almost at the water and just do a two tap jerk. I then reel in the slack and two tap jerk. I only pause for 5-10 seconds between jerks.
I found after playing with this bait in the swimming pool that the little jerks made it look like a craw or a squid or whatever it is is.
Using the above method I have caught 4 consectutive fish on 4 consecutive casts. This is my confidence bait and my go to around weeds, in the open, on shore, in cover, around structure, in the grass, everywhere.
I would try the Ika instead of the senko and see how it does.