By my calculations in my excel spreadsheets, that 0-8-16 ratio equals 1240ppm (.7 conversion) or around 1.8 EC.
The grow only has an NPK rating of 2-1-6, not exactly the nitrogen powerhouse. If you added it and kept plants healthy, more power to you. In regards to your feeding levels, do what works best for you, your environment and your plants. I can tell you this much, I would never, ever, ever, feed at those levels, ever. My experience and tests have shown me that if you put food in your res in modest concentrations, the plants will be able to pick and choose what they need to pull up. As long as you're not underfeeding certain elements or locking out others by overfeeding or feeding in bad ratios, you're going to get great results. There is more to this than 'just do what you think works best' but I feel like everyone needs to live and learn.