I'll start by admitting I am merely a homeowner...not a lawn pro! Now, on to the issue I need help resolving, but first, a bunch of backround info so you'll get the idea. I have a residential sized 1/3 acre yard or about 10,000 sq.ft. of turf in central Indiana. Exactly two years ago, I started a huge lawn/yard renovation project which included removing all bushes and a few trees as well as improved drainage by burying downspout runoff. After adding about 10 yards of topsoil and re-grading about 60% of the entire lawn area, I waited until Fall of 2006 and performed a core aeration and overseeding to the ENTIRE lawn. Within a month, I had grass (50-50 mix of Kentucky blue/perennial rye). It turned out pretty nice but I wasn't completely satisfied. After last summer's ('07) drought, I got sick of dragging hose around the yard to water the lawn so I added an in-ground irrigation system. (I know, should have thought of this in '06.) Even though the contractor was careful, about 20% of the lawn was torn up due to trenching irrigation pipe, etc. With Fall fast approaching, I wanted to repair the lawn damage and thicken the entire grass so I used a slice-seeder and overseeded. With the help of my new irrigation system, my new grass really came in nicely. After the Spring rains we've had this year ('08) and two apps of Scott's fertilized (yes, Pre-emergent), the lawn looks quite good..with only two complaints. #1) The lawn is still quite bumpy. #2) Bare areas that haven't filled in with new grass. You see, when I slice-seeded last Fall, I really couldn't take the time to "perfectly repair" or level the areas disturbed by trenching. Therefore, the slicer/seeder was riding over un-even terrain and wasn't always making a good "seed bed" for my seed. As a result, I have several small patches (8"-12") in my lawn where grass didn't grow...and again, the yard is lumpy/bumpy. Overall, my lawn could stand to be thicker to prevent weeds from finding a place to grow. What are the best ways to address my two complaints??? What about core aerating followed by topressing...then broadcasting more seed over the top??? How would this approach level out the bumpy/lumpy areas??? Won't they still be needing some dirt to bring them up to grade level??? How would I spread a topdressing mixture of peat and compost??? Would adding sand to my topdressing mixture create a problem for my sprinkler heads??? Thanks for reading this NOVEL. Your ideas are greatly appreciated!!! P.S. Please, NO FAIR SUGGESTING I USE A ROLLER. I don't think it's a good idea to compact the turf area. Afterall, isn't this why they make core aerators?