Now I know why I can't find any of my favorite lures..
I agree with "smaller lure in low clear (#3), and 4's and 5's in colored, higher water" theory. Also the Flash-glo's. Try modifying the Vibrax lures by attaching a SHORT chain to the lure with a good siwash on the end-seems to hook them a little better. And we all know presentation counts. Gotta put the lure down where they are!