Nitrites look between 0.5 and 1ppm to me, but it doesn't really matter, your cycle is progressing nicely. As long as your nitrites are not off your chart (nitrites over 10ppm can stall your cycle) you don't need to worry. And yes, it's normal to start seeing nitrates at the stage you are in, it's a good sign.
The liquid test kits are much better than test strips but they are still fairly inaccurate due to the subjectivity in determining color and inconsistencies in the color charts (there are a few threads on this). I own both the master API chart that you have and individual charts and there are significant color differences between them. That being said the liquid test kit will suffice for most aquarists needs. In a cycled tank ammonia and nitrites should be 0 if you get a reading something is up and obviously the higher the reading the worse for your fish so a liquid test kit can get you this info. Bottom line is don't worry too much about interpreting minor color differences on those kits.