Congrats on the new lawn! It's coming in pretty evenly, too. The roots are likely going to be shallow the first 2 years, especially on hard soil, so for this year try not to concentrate too much on the green top. A basic step aerator from Lowe's will help open up the base, but don't go nuts, just a few steps here & there where you need it--High spots, hard spots, etc. If I could start over, I would have sprayed monthly the first Year with baby shampoo, rooting hormone or compost tea, anything to encourage rooting because it has a direct effect on the top growth. Don't scalp it yet either, that starts after you have good solid roots across the whole yard. Be careful with mulch mowing too, the bacteria & worms are not able to break down the thatch for you yet, so it tends to build up the first 2 years & cause the turf to thin out instead of spreading horizontally. Good luck & come back often!