It's supposed to be so, yep. But what does 28.65 ml/l in your diary mean? Is it 28.65ml per 10 liters?
Weird to see these numbers since it's 8 ml/l a+b maximum (summarized) according to a default guide. And you can also show it in a diary for each component, just look for "canna coco" and put it twice when you'll add nutrition data next time/edit your diaries.
You can generate specific schedule chart for you here http://www.cannagardening.com/growguide
And you should lower the PH to around 6 before that. So you set the PH of the water first, then add component a, mix it, and then component b.
PH levels around 5.8-6.2 considered best AFAIK, 5.5 - 6.5 is OK, anything out of that range is not-so-good.