I have'nt tried the underspin jig's yet but the Walleye assassin I try different speed's to see what there doing, and I will reel it, and then stop and let it drop and that was working well. If I'm deeper and there on the bottom, I like to bang the bottom and watch your line close and they about all way's hit on the fall and your line will pop when they suck it in. But if they don't I will hit bottom three time's and start reeling up, and that will trigger a bite a lot of time.
Hope this help's.
Have a good one