Nice job my friend!
Looking real nice.
You will be very succcessful in your growing adventures.
If I was you. I would just look for a good Organic based flowering additive. That is high in P and K but a low Nitrogen amount.
Use it along with your flowering nutes.
Just find something thats meant for flowering that is organic with sea bird and bat Guano in it.
Along with high P and K. If you have to .Order it of the web.