Often times I crawl a Slider across the bottom, as well as a Road Runner. The way I look at it, you just have give them what they want, not what you want to give them! And if that means a speedy retrieve across the surface (which works amazingly well - at times) or slow crawling it on the bottom, then just do it. I usually start mid depths with a slow retrieve and the start to vary it from there. You just never know.