OK, I'll take my turn at the help desk and throw out this scenario:Southern California, USDA zone 9, High Clay content soil, Hybrid Tall Fescue lawn in 4th year cut at 2.75 inches.Issues:Overall Health - My lawn looks worse now than it did two years ago. It's thinning, takes lots of water not to wilt, and it's natural green (pre fertilizer) isn't as dark as it used to be.Clay Soil - When prepping for grass, amended soil with gypsum per local landscape supply. I have since broadcast applied (50lbs/5000 sqft) once a year in fall. I don't think its working as evidenced by Health of Lawn (see above), water run-off, and hard feel of ground. Suggestions for treatment?Lumpy/Uneven - When I prep'd for the sod, I had the soil leveled to a frigg'en T! Now the back yard is full of ankle twisting lumps and the front yard has several low, "sunk-in" spots. How do I fix this?Fertilizing - I typically hit the grass with a weed-n-feed in the spring, straight fertilizer twice over summer, then a "winterizer" in the fall. I changed gears after I noticed the weed-n-feed seemed to harm the grass and have been skipping it. Last year instead of using a Scott's ect fertilizer, I went with straight ammonium sulfate (carefully applied to prevent burns) and it greened my grass like never before. What do you think? Thoughts on adding Iron or using a 16-16-16 fertilizer blend?Watering - I constantly read about over-watering, but the fact is, if I don't water twice a day (forget the total inches of water at the moment), my grass doesn't hold up. Of course if I go too much I suffer from mushrooms (and the bill). I suspect the clay is at fault here. Suggestions?OK, that's enough for now - I know its long, but I appreciate any help you can provide!