Humidity is a bit low for veg. Which should be 45-50% In flower you will want humidity at 35-40&. However; Plants adapt and this should not be your problem. It seems to me that you are on the right track, but I never saw where you mention how many gallons your rez holds.

At the stage you are at; I would be running ppm at about 1200 ppm with ph of 5.7. So your solution is weak in my opinion.

Are you running fans? One should be aimed right below the 1000 watt to blow away radient heat; the 2nd fan should be oscillating in order to move air all about the room.

Temps are fine.

don't use rhizotonic so I cannot comment on that. But; I would never add an extra 2 tsp here, and then again later!

Light times of 18 hours is typical of Veg cycle, but I always use shorter cycles like 16 hours in order to attempt to induce female plants. Longer light periods on plants from seed tend to cause more male plants.

Hope all is well; I see you quit posting a while back, and; I also think that if you8 have issues; You should post a couple good clear picks of problem area.