I haven't discovered who the killer is, but we are now using a seed called Zodiac. Zodiac is a chewings fescue that I have had blended with ryegrass (60% rye grass and 40% Zodiac chewings fescue) to use as an overseed material. I learned about this during a webinar that Sierra Pacific Turf Supply put on for its golf course customers. The one fact that really caught my ear was that chewings fescue requires 30% less water than rye grass. Continuing that thought, if we can get some of this Zodiac fescue established in our dry spots, over the years our dry spots won't look as dry. The ultimate goal is firmer and faster with much less turf desiccation than we currently experience.