When I whip up some scuds usually have some weight tied in there, too, so they have a good tendency to sink!

So what I do for still water is cast them out and let'em sink ... if that's what's working I'll usually get a responce from the fish while they are sinking! If noting happens on the way down, will then give them a couple of short stripping tugs, if nothing, retrieve and cast in another area.