Morning BlueBudz, I wouldn't be in any hurry to initiate Bloom nutrients, if they are still growing, keep doing like your doing, an let them get bigger, which means big buds, even after I see pistils I don't start immediately with bloom nutrients, you want to try to get all the growth you can, when you start bloom nutrients they pretty much stop plant growth, least that's how I try to do it.
Everyone is different.
Your plants are looking great, I sure wish your hydro guy, would at least study up on that product, an have an open mind, an not be hardheaded, because it WORKS , like no other I've found, except for homemade.