Am I using ferts the right way?

It's always useful to work off a schedule made by a company, do that for your first few grows (start at 1/4 strength then build up), good luck!

Everything looks good. Keep doing what you have.

If it's not going high in tds your ok, feeding schedules unless their made out specifically for cannabis you cant follow what the label on the bottle says.,they tell you to use twice the amount you actually need. Best to get a tds ph reader if you dont own one and feed by total ppm to know your not giving your girls toxic amounts of nutrients. Always half what the label says and always give enough runoff to keep salts from building when you plain water. Luck friend