I am working on a project with an embedded 32u4 and was using the Adafruit 32u4 breakout as an example. I was wonder about the crystal load capacitors. The schematic has 2 18pf capacitors and the only crystals on digi-key that are the same need 8pf. I know you have to account for other stray and pin capacitances but I wanted to make sure this was right. Also was wondering which part was used if it was the one with 30\20ppm tolerance for 50\50.