One or two follow ups: As far as presentation of the DS goes, I've learned a very important lesson over the years. That is, not to overwork the bait you present.
It's very easy to want to "do" something with it, while it sits there, suspended above the bottom. However, if you have a chance to see your presentation in VidCam (i.e.: AquaView) on the bottom, you would see your bait quivering lightly there, with no movement required on your part. Pretty neat stuff! What I do is dead-stick it as soon as my sinker settles. If nothing after a minute or so, I'll give it a few shakes, then stop again. Sooner or later, your rod tip will bend toward the bottom, at which point, all you have to do is to start reeling as fast as you can! I mean, FAST! When the smallie feels the hook, there's only one place he wants to be....in the air! Most fish are lost when slack is given on this initial line take up.
As far as rivers go, I have used it in eddys and some current breaks. In this case, most of my success occurs when I "slip" (Dan Gapen, circa 1970) the current with my trolling motor. That means that I allow my boat to drift downstream - bow up - at a rate slower than the current. What this does is to make it easy for you to maintain bottom contact with your sinker. All you need to do is to raise your rod tip a bit to move the sinker downstream with you as you drift. Very effective! And no movement on your part, like shaking, is required. Also, in river, I'll up-size my sinker from 1/4 oz. to 1/2 oz....sometimes even up to 3/4 oz., depending on the current and depth I'm targeting.
I think I've covered just about everything in your question rw. Let me know if I missed anything. Good Luck!