I would water about a cup or two, then wait a minute. You want to see a small amount of runoff, not a river, just enough to know that some amount of the water is washing away the root exudates and excess minerals that build up in containers. You should never wait until your medium is bone dry, if you let it get dry it will become hydrophobic and potentially runoff much more heavily without actually getting re-saturated. Basically just water a bit, wait, see runoff stop. Don't see runoff, water half-again as much and wait another few minutes. Some folks water, wait an hour, then finish watering until they see runoff. This gives the medium time to absorb the fertigation, then you come back and really make sure it got a little flush. Roots give off waste products that can be harmful to plant health, that's really what causes "rootbound" symptoms. It's not actually that the roots can't expand into the medium because they can fully colonize a container to the point where it's almost all roots. The real issue is that then those roots sit in their own 'piss' and get unhealthy...that doesn't happen if you water properly OR use a huge pot that gives them room to spread out.
Don't think that way, just focus on weight. Start off with a fully saturated medium, plant a seed, water it when the pot feels light. Period.
I don't know much about their fertilizer products other than to say I'm sort of a hater because of the results I'm seeing in the infirmary lately. If I were experimenting with a new nutrient lineup, I would only purchase their base fertilizer without any additional crap, too many variables to worry about without a clear reason to do so. If their base fertilizer doesn't grow healthy plants, I would move on to another product line whose base fertilizer grows healthy plants. Once you have a strategy to grow healthy plants with a base fertilizer and you feel the need to experiment, I would gradually add in one additional product at a time and gauge whether it improves plant health or not. If not, I would cut it out and go back to a base regimen.
Any fertilizer company whose base NPK products don't grow plants should be avoided.