Do you output at 10 quality or 12? It's a small difference in quality, a big different in size, but I feel it's worth it.
They were FRAPS PNGs but I dropped them to 100% Jpegs in photoshop. Idk why they look compressed. It must be the SMAA.
Also, just a heads up, you may have noticed that opening uncompressed PNG's in photoshop makes them look brighter and a bit duller because it converts them to 8-bit color mode from 32-bit bit.
The solution for that is that if you make an automated script for what you want to do for the image, and then have photoshop automate that process, it does all the work to it without ever converting it to 8-bit, so the colors stay as they were.
If you know another way to save with the full color in CS6 that can actually be shared here let me know.